CVE-2021-35210

mediumpriority · track · 24EPSS 0.007 · 54 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.74% (54th) EPSS

CVSS 4.3 · medium

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

Contao 4.5.x through 4.9.x before 4.9.16, and 4.10.x through 4.11.x before 4.11.5, allows XSS. It is possible to inject code into the tl_log table that will be executed in the browser when the system log is called in the back end.

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

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

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

v3.16.1mediumCVSS: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)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79US

affected products (7)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
contao contao4.10.0 → 4.11.5nvdUScpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*
contao contao4.5.0 → 4.9.16nvdUScpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*
Packagist contao/contao4.10.0 → 4.11.5osvUSpkg:composer/contao/contao
Packagist contao/contao4.5.0 → 4.9.16osvUSpkg:composer/contao/contao
Packagist contao/core-bundle4.10.0 → 4.11.5osvUSpkg:composer/contao/core-bundle
Packagist contao/core-bundle4.5.0 → 4.9.16osvUSpkg:composer/contao/core-bundle

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-h58v-c6rf-g9f7Cross site scripting in the system log2021-07-01ghsa · osvUS
### Impact It is possible to inject code into the `tl_log` table that will be executed in the browser when the system log is called in the back end. ### Patches Update to Contao 4.9.16 or 4.11.5. ### Workarounds Disable the system log module in the back end for all users (especially admin users). ### References https://contao.org/en/security-advisories/cross-site-scripting-in-the-system-log-2021 ### For more information If you have any questions or comments about this advisory, open an issue in [contao/contao](https://github.com/contao/contao/issues/new/choose).

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 2021-06-23modified 2026-06-17

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+53008 more

references (8)

External citations — patches, advisories, analysis.

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