GHSA-628f-v4f6-p37r

Suggest an improvement
Source
https://github.com/advisories/GHSA-628f-v4f6-p37r
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-628f-v4f6-p37r/GHSA-628f-v4f6-p37r.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-628f-v4f6-p37r
Aliases
  • CVE-2026-107845
Published
2026-10-09T20:53:50Z
Modified
2026-10-09T21:00:08Z
Severity
  • 9.3 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N CVSS Calculator
Summary
Contao: Cross-site scripting in the comments bundle
Details

An unauthenticated front end visitor can post a comment containing a XSS injection. The victim is any back end user who opens the Comments module, and moderation makes exposure certain rather than preventing it. No Content-Security-Policy header is sent on the Contao back end, so nothing mitigates the inline handler.

Impact

Anyone on the internet can inject script that executes in the Contao back end origin, under the session of whichever user opens the Comments module, with no click and no hover. From there the payload acts as that user through the back end: reading any module they can reach, creating a new administrator, or editing a template, which on Contao is a documented path from back end write access to code execution. Moderation does not help and in fact guarantees exposure, since unpublished comments are still inserted and a moderator has to open the list to act on them.

Database specific 
{
    "cwe_ids": [
        "CWE-116",
        "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-09T20:53:50Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
}
References

Affected packages

Packagist / contao/comments-bundle

Package

Name
contao/comments-bundle
Purl
pkg:composer/contao/comments-bundle

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.0.0
Fixed
5.3.50

Affected versions

4.*
4.0.0
4.0.1
4.0.2
4.0.3
4.1.0-beta1
4.1.0-RC1
4.1.0
4.1.1
4.1.2
4.2.0-beta1
4.2.0-RC1
4.2.0
4.2.1
4.3.0-RC1
4.3.0
4.3.1
4.3.2
4.3.3
4.3.4
4.3.5
4.3.6
4.3.7
4.3.8
4.3.9
4.3.10
4.3.11
4.4.0-beta1
4.4.0-RC1
4.4.0-RC2
4.4.0
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.4.6
4.4.7
4.4.8
4.4.9
4.4.10
4.4.11
4.4.12
4.4.13
4.4.14
4.4.15
4.4.16
4.4.17
4.4.18
4.4.19
4.4.20
4.4.21
4.4.22
4.4.23
4.4.24
4.4.25
4.4.26
4.4.27
4.4.28
4.4.29
4.4.30
4.4.31
4.4.32
4.4.33
4.4.34
4.4.35
4.4.36
4.4.37
4.4.38
4.4.39
4.4.40
4.4.41
4.4.42
4.4.43
4.4.44
4.4.45
4.4.46
4.4.47
4.4.48
4.4.49
4.4.50
4.4.51
4.4.52
4.4.53
4.4.54
4.4.55
4.4.56
4.4.57
4.5.0-beta1
4.5.0-beta2
4.5.0-beta3
4.5.0-RC1
4.5.0-RC2
4.5.0
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.5.6
4.5.7
4.5.8
4.5.9
4.5.10
4.5.11
4.5.12
4.5.13
4.5.14
4.6.0-RC1
4.6.0-RC2
4.6.0-RC3
4.6.0
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.6.6
4.6.7
4.6.8
4.6.9
4.6.10
4.6.11
4.6.12
4.6.13
4.6.14
4.7.0-RC1
4.7.0-RC2
4.7.0-RC3
4.7.0-RC4
4.7.0
4.7.1
4.7.2
4.7.3
4.7.4
4.7.5
4.7.6
4.7.7
4.8.0-RC1
4.8.0-RC2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.8.8
4.9.0-RC1
4.9.0-RC2
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
4.9.8
4.9.9
4.9.10
4.9.11
4.9.12
4.9.13
4.9.14
4.9.15
4.9.16
4.9.17
4.9.18
4.9.19
4.9.20
4.9.21
4.9.22
4.9.23
4.9.24
4.9.25
4.9.26
4.9.27
4.9.28
4.9.29
4.9.30
4.9.31
4.9.32
4.9.33
4.9.34
4.9.35
4.9.36
4.9.37
4.9.38
4.9.39
4.9.40
4.9.41
4.9.42
4.10.0-RC1
4.10.0-RC2
4.10.0-RC3
4.10.0-RC4
4.10.0
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.10.6
4.10.7
4.11.0-RC1
4.11.0-RC2
4.11.0
4.11.1
4.11.2
4.11.3
4.11.4
4.11.5
4.11.6
4.11.7
4.11.8
4.11.9
4.12.0-RC1
4.12.0-RC2
4.12.0-RC3
4.12.0
4.12.1
4.12.2
4.12.3
4.12.4
4.12.5
4.12.6
4.12.7
4.13.0-RC1
4.13.0-RC2
4.13.0-RC3
4.13.0
4.13.1
4.13.2
4.13.3
4.13.4
4.13.5
4.13.6
4.13.7
4.13.8
4.13.9
4.13.10
4.13.11
4.13.12
4.13.13
4.13.14
4.13.15
4.13.16
4.13.17
4.13.18
4.13.19
4.13.20
4.13.21
4.13.22
4.13.23
4.13.24
4.13.25
4.13.26
4.13.27
4.13.28
4.13.29
4.13.30
4.13.31
4.13.32
4.13.33
4.13.34
4.13.35
4.13.36
4.13.37
4.13.38
4.13.39
4.13.40
4.13.41
4.13.42
4.13.43
4.13.44
4.13.45
4.13.46
4.13.47
4.13.48
4.13.49
4.13.50
4.13.51
4.13.52
4.13.53
4.13.54
4.13.55
4.13.56
4.13.57
4.13.58
5.*
5.0.0-RC1
5.0.0-RC2
5.0.0-RC3
5.0.0-RC4
5.0.0
5.0.1
5.0.2
5.0.3
5.0.4
5.0.5
5.0.6
5.0.7
5.0.8
5.0.9
5.0.10
5.1.0-RC1
5.1.0-RC2
5.1.0-RC3
5.1.0
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.1.6
5.1.7
5.1.8
5.1.9
5.1.10
5.1.11
5.2.0-RC1
5.2.0-RC2
5.2.0-RC3
5.2.0-RC4
5.2.0-RC5
5.2.0-RC6
5.2.0
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.2.8
5.2.9
5.2.10
5.3.0-RC1
5.3.0-RC2
5.3.0-RC3
5.3.0-RC4
5.3.0
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.3.7
5.3.8
5.3.9
5.3.10
5.3.11
5.3.12
5.3.13
5.3.14
5.3.15
5.3.16
5.3.17
5.3.18
5.3.19
5.3.20
5.3.21
5.3.22
5.3.23
5.3.24
5.3.25
5.3.26
5.3.27
5.3.28
5.3.29
5.3.30
5.3.31
5.3.32
5.3.33
5.3.34
5.3.35
5.3.36
5.3.37
5.3.38
5.3.39
5.3.40
5.3.41
5.3.42
5.3.43
5.3.44
5.3.45
5.3.46
5.3.47
5.3.48
5.3.49

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-628f-v4f6-p37r/GHSA-628f-v4f6-p37r.json"

Packagist / contao/comments-bundle

Package

Name
contao/comments-bundle
Purl
pkg:composer/contao/comments-bundle

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.4.0-RC1
Fixed
5.7.12

Affected versions

5.*
5.4.0-RC1
5.4.0-RC2
5.4.0-RC3
5.4.0-RC4
5.4.0
5.4.1
5.4.2
5.4.3
5.4.4
5.4.5
5.4.6
5.4.7
5.4.8
5.4.9
5.4.10
5.4.11
5.4.12
5.4.13
5.4.14
5.5.0-RC1
5.5.0-RC2
5.5.0-RC3
5.5.0-RC4
5.5.0
5.5.1
5.5.2
5.5.3
5.5.4
5.5.5
5.5.6
5.5.7
5.5.8
5.5.9
5.5.10
5.5.11
5.5.12
5.5.13
5.5.14
5.5.15
5.5.16
5.6.0-RC1
5.6.0-RC2
5.6.0-RC3
5.6.0
5.6.1
5.6.2
5.6.3
5.6.4
5.6.5
5.6.6
5.6.7
5.6.8
5.6.9
5.6.10
5.6.11
5.7.0-RC1
5.7.0-RC2
5.7.0-RC3
5.7.0-RC4
5.7.0
5.7.1
5.7.2
5.7.3
5.7.4
5.7.5
5.7.6
5.7.7
5.7.8
5.7.9
5.7.10
5.7.11

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-628f-v4f6-p37r/GHSA-628f-v4f6-p37r.json"