CVE-2021-23980

mediumpriority · track · 24EPSS 0.005 · 41 %ileEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.48% (41st) EPSS
CVSS 6.1 · medium
Is it mine?
37 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

A mutation XSS affects users calling bleach.clean with all of: svg or math in the allowed tags p or br in allowed tags style, title, noscript, script, textarea, noframes, iframe, or xmp in allowed tags the keyword argument strip_comments=False Note: none of the above tags are in the default allowed tags and strip_comments defaults to True.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedautomation-hub-0:4.2.2-1.el7pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedautomation-hub-0:4.2.2-1.el7pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedautomation-hub-0:4.2.2-1.el8pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedautomation-hub-0:4.2.2-1.el8pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-bleach-0:3.3.0-1.el7pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-bleach-0:3.3.0-1.el8pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-bleach-allowlist-0:1.0.3-1.el7pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-bleach-allowlist-0:1.0.3-1.el8pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-galaxy-importer-0:0.2.15-1.el7pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-galaxy-importer-0:0.2.15-1.el8pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-galaxy-ng-0:4.2.2-1.el7pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-galaxy-ng-0:4.2.2-1.el8pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-pulp-ansible-1:0.5.6-1.el7pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython-pulp-ansible-1:0.5.6-1.el8pc.src as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-bleach-0:3.3.0-1.el7pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-bleach-0:3.3.0-1.el8pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-bleach-allowlist-0:1.0.3-1.el7pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-bleach-allowlist-0:1.0.3-1.el8pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-django-0:2.2.18-1.el7pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-django-0:2.2.18-1.el8pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-galaxy-importer-0:0.2.15-1.el7pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-galaxy-importer-0:0.2.15-1.el8pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-galaxy-ng-0:4.2.2-1.el7pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-galaxy-ng-0:4.2.2-1.el8pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-pulp-ansible-1:0.5.6-1.el7pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 7redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
  • Fixedpython3-pulp-ansible-1:0.5.6-1.el8pc.noarch as a component of Red Hat Automation Hub 4.2 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2021:0781
02

cvss

Technical severity, 0–10. One row per scoring source.

6.1
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7
v3.16.1mediumAV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU
v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · ENISA EU
v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondaryexploitability 2.8 · impact 2.7
v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · OSV
v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)
v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · Red Hat Product Security US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79USCWE-79USCWE-79US
05

affected products (37)

Products and version ranges known to be affected.

showing 20 of 37
06

advisories (3)

Vendor and ecosystem advisories describing this.

  • RHSA-2021:0781Red Hat Security Advisory: Red Hat Ansible Automation Platform 1.2.2 security and bug fix update2021-03-09csaf · redhat_csafUS

    An update is now available for Red Hat Ansible Automation Platform 1.2.2. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

  • GHSA-vv2x-vrpj-qqpqCross-site scripting in Bleach2021-02-02ghsa · osvUS

    ### Impact A [mutation XSS](https://cure53.de/fp170.pdf) affects users calling `bleach.clean` with all of: * `svg` or `math` in the allowed tags * `p` or `br` in allowed tags * `style`, `title`, `noscript`, `script`, `textarea`, `noframes`, `iframe`, or `xmp` in allowed tags * the keyword argument `strip_comments=False` Note: none of the above tags are in the default allowed tags and `strip_comments` defaults to `True`. ### Patches Users are encouraged to upgrade to bleach v3.3.0 or greater. Note: bleach v3.3.0 introduces a breaking change to escape HTML comments by default. ### Workarounds * modify `bleach.clean` calls to at least one of: * not allow the `style`, `title`, `noscript`, `script`, `textarea`, `noframes`, `iframe`, or `xmp` tag * not allow `svg` or `math` tags * not allow `p` or `br` tags * set `strip_comments=True` * A strong [Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) without `unsafe-inline` and `unsafe-eval` [`script-src`s](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src)) will also help mitigate the risk. ### References * https://bugzilla.mozilla.org/show_bug.cgi?id=1689399 * https://advisory.checkmarx.net/advisory/CX-2021-4303 * https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23980 * https://cure53.de/fp170.pdf ### Credits * Reported by [Yaniv Nizry](https://twitter.com/ynizry) from the CxSCA AppSec group at Checkmarx * Additional eject tags not mentioned in the original advisory and the CSP mitigation line being truncated in the revised advisory reported by [Michał Bentkowski](https://twitter.com/SecurityMB) at Securitum ### For more information If you have any questions or comments about this advisory: * Open an issue at [https://github.com/mozilla/bleach/issues](https://github.com/mozilla/bleach/issues) * Email us at [security@mozilla.org](mailto:security@mozilla.org)

  • PYSEC-2021-8652021-02-02vendor · osvUS

    In Mozilla Bleach before 3.3.0, a mutation XSS affects users calling bleach.clean with math or svg; p or br; and style, title, noscript, script, textarea, noframes, iframe, or xmp tags with strip_comments=False.

07

also known as (7)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bduosvnvdredhat_csafNVDCVE.orgMITRE
published 2023-02-16modified 2026-06-17
10

references (12)

External citations — patches, advisories, analysis.

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