CVE-2020-11083

lowpriority · track · 19EPSS 0.011 · 67 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.15% (67th) EPSS

CVSS 3.5 · low

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

In October from version 1.0.319 and before version 1.0.466, a user with access to a markdown FormWidget that stores data persistently could create a stored XSS attack against themselves and any other users with access to the generated HTML from the field. This has been fixed in 1.0.466. For users of the RainLab.Blog plugin, this has also been fixed in 1.4.1.

cvss

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

4.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.5–4.8

v2.03.5lowAV:N/AC:M/Au:S/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 6.8 · impact 2.9

v3.14.8mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 1.7 · impact 2.7

v3.13.5lowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:Nsecondary · ENISA EU

v3.13.5lowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:Nsecondary · security-advisories@github.comexploitability 0.9 · impact 2.5

v3.13.5lowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:Nsecondary · OSV

v3.14.4mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79US

affected products (3)

Products and version ranges known to be affected.

October CMS October1.0.319, → 1.0.466enisa_euvdEU
octobercms october1.0.319 → 1.0.466nvdUScpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:*
Packagist october/backend1.0.319 → 1.0.466osvUSpkg:composer/october/backend

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-w4pj-7p68-3vgvStored XSS in October2020-08-05ghsa · osvUS
### Impact A user with access to a markdown FormWidget that stores data persistently could create a stored XSS attack against themselves and any other users with access to the generated HTML from the field. ### Patches Issue has been patched in Build 466 (v1.0.466) & RainLab.Blog v1.4.1 by restricting the ability to store JS in markdown to only users that have been explicitly granted the `backend.allow_unsafe_markdown` permission. ### Workarounds Apply https://github.com/octobercms/october/commit/9ecfb4867baae14a0d3f99f5b5c1e8a979ae8746 & https://github.com/rainlab/blog-plugin/commit/6ae19a6e16ef3ba730692bc899851342c858bb94 to your installation manually if unable to upgrade to Build 466 or v1.4.1 of RainLab.Blog (if using that plugin). ### References Reported by [Sivanesh Ashok](https://stazot.com/) ### For more information If you have any questions or comments about this advisory: * Email us at [hello@octobercms.com](mailto:hello@octobercms.com) ### Threat assessment: <img width="1100" alt="Screen Shot 2020-03-31 at 2 01 52 PM" src="https://user-images.githubusercontent.com/7253840/78070158-8f7ef580-7358-11ea-950c-226533f6a0a3.png">

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2020-07-14modified 2026-06-17

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+53052 more

references (17)

External citations — patches, advisories, analysis.

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