CVE-2026-107845
CVE-2026-107845 · Contao: Cross-site scripting in the comments bundle
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Contao is an Open Source CMS. From version 4.0.0 until 5.3.50 and 5.7.12, an unauthenticated visitor can submit a comment whose email or website metadata is rendered without sufficient attribute and URL encoding by listComments() in comments-bundle/contao/dca/tl_comments.php. When a backend user opens the Comments module, attacker-controlled script can execute in the Contao backend origin under that user's session. Unpublished comments remain visible to moderators, so moderation does not prevent exposure. This issue is fixed in versions 5.3.50 and 5.7.12.
CVSS 9.3 · Critical · EPSS 0.3% · Fix available
- Published
- Updated
Stack: php
Affected products and versions
contao
- Versions
- >= 4.0.0, < 5.3.50: Affected
- >= 5.4.0-RC1, < 5.7.12: Affected
No fix published
contao/comments-bundle Packagist
- Versions
- 4.0.0
- 4.0.1
- 4.0.2
- 4.0.3
- 4.1.0
- 4.1.0-RC1
- 4.1.0-beta1
- 4.1.1
- 4.1.2
- 4.10.0
- 4.10.0-RC1
- 4.10.0-RC2
- 4.10.0-RC3
- 4.10.0-RC4
- 4.10.1
- 4.10.2
- 4.10.3
- 4.10.4
- 4.10.5
- 4.10.6
- 4.10.7
- 4.11.0
- 4.11.0-RC1
- 4.11.0-RC2
- 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
- 4.12.0-RC1
- 4.12.0-RC2
- 4.12.0-RC3
- 4.12.1
- 4.12.2
- 4.12.3
- 4.12.4
- 4.12.5
- 4.12.6
- 4.12.7
- 4.13.0
- 4.13.0-RC1
- 4.13.0-RC2
- 4.13.0-RC3
- 4.13.1
- 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
- 4.13.2
- 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
- 4.13.3
- 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
- 4.13.4
- 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
- 4.13.5
- 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
- 4.13.6
- 4.13.7
- 4.13.8
- 4.13.9
- 4.2.0
- 4.2.0-RC1
- 4.2.0-beta1
- 4.2.1
- 4.3.0
- 4.3.0-RC1
- 4.3.1
- 4.3.10
- 4.3.11
- 4.3.2
- 4.3.3
- 4.3.4
- 4.3.5
- 4.3.6
- 4.3.7
- 4.3.8
- 4.3.9
- 4.4.0
- 4.4.0-RC1
- 4.4.0-RC2
- 4.4.0-beta1
- 4.4.1
- 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
- 4.4.2
- 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
- 4.4.3
- 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
- 4.4.4
- 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
- 4.4.5
- 4.4.50
- 4.4.51
- 4.4.52
- 4.4.53
- 4.4.54
- 4.4.55
- 4.4.56
- 4.4.57
- 4.4.6
- 4.4.7
- 4.4.8
- 4.4.9
- 4.5.0
- 4.5.0-RC1
- 4.5.0-RC2
- 4.5.0-beta1
- 4.5.0-beta2
- 4.5.0-beta3
- 4.5.1
- 4.5.10
- 4.5.11
- 4.5.12
- 4.5.13
- 4.5.14
- 4.5.2
- 4.5.3
- 4.5.4
- 4.5.5
- 4.5.6
- 4.5.7
- 4.5.8
- 4.5.9
- 4.6.0
- 4.6.0-RC1
- 4.6.0-RC2
- 4.6.0-RC3
- 4.6.1
- 4.6.10
- 4.6.11
- 4.6.12
- 4.6.13
- 4.6.14
- 4.6.2
- 4.6.3
- 4.6.4
- 4.6.5
- 4.6.6
- 4.6.7
- 4.6.8
- 4.6.9
- 4.7.0
- 4.7.0-RC1
- 4.7.0-RC2
- 4.7.0-RC3
- 4.7.0-RC4
- 4.7.1
- 4.7.2
- 4.7.3
- 4.7.4
- 4.7.5
- 4.7.6
- 4.7.7
- 4.8.0
- 4.8.0-RC1
- 4.8.0-RC2
- 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
- 4.9.0-RC1
- 4.9.0-RC2
- 4.9.1
- 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
- 4.9.2
- 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
- 4.9.3
- 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
- 4.9.4
- 4.9.40
- 4.9.41
- 4.9.42
- 4.9.5
- 4.9.6
- 4.9.7
- 4.9.8
- 4.9.9
- 5.0.0
- 5.0.0-RC1
- 5.0.0-RC2
- 5.0.0-RC3
- 5.0.0-RC4
- 5.0.1
- 5.0.10
- 5.0.2
- 5.0.3
- 5.0.4
- 5.0.5
- 5.0.6
- 5.0.7
- 5.0.8
- 5.0.9
- 5.1.0
- 5.1.0-RC1
- 5.1.0-RC2
- 5.1.0-RC3
- 5.1.1
- 5.1.10
- 5.1.11
- 5.1.2
- 5.1.3
- 5.1.4
- 5.1.5
- 5.1.6
- 5.1.7
- 5.1.8
- 5.1.9
- 5.2.0
- 5.2.0-RC1
- 5.2.0-RC2
- 5.2.0-RC3
- 5.2.0-RC4
- 5.2.0-RC5
- 5.2.0-RC6
- 5.2.1
- 5.2.10
- 5.2.2
- 5.2.3
- 5.2.4
- 5.2.5
- 5.2.6
- 5.2.7
- 5.2.8
- 5.2.9
- 5.3.0
- 5.3.0-RC1
- 5.3.0-RC2
- 5.3.0-RC3
- 5.3.0-RC4
- 5.3.1
- 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
- 5.3.2
- 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
- 5.3.3
- 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
- 5.3.4
- 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
- 5.3.5
- 5.3.6
- 5.3.7
- 5.3.8
- 5.3.9
- Affected ranges
- ECOSYSTEM: ≥ 4.0.0, < 5.3.50
Update to 5.3.50
contao/comments-bundle Packagist
- Versions
- 5.4.0
- 5.4.0-RC1
- 5.4.0-RC2
- 5.4.0-RC3
- 5.4.0-RC4
- 5.4.1
- 5.4.10
- 5.4.11
- 5.4.12
- 5.4.13
- 5.4.14
- 5.4.2
- 5.4.3
- 5.4.4
- 5.4.5
- 5.4.6
- 5.4.7
- 5.4.8
- 5.4.9
- 5.5.0
- 5.5.0-RC1
- 5.5.0-RC2
- 5.5.0-RC3
- 5.5.0-RC4
- 5.5.1
- 5.5.10
- 5.5.11
- 5.5.12
- 5.5.13
- 5.5.14
- 5.5.15
- 5.5.16
- 5.5.2
- 5.5.3
- 5.5.4
- 5.5.5
- 5.5.6
- 5.5.7
- 5.5.8
- 5.5.9
- 5.6.0
- 5.6.0-RC1
- 5.6.0-RC2
- 5.6.0-RC3
- 5.6.1
- 5.6.10
- 5.6.11
- 5.6.2
- 5.6.3
- 5.6.4
- 5.6.5
- 5.6.6
- 5.6.7
- 5.6.8
- 5.6.9
- 5.7.0
- 5.7.0-RC1
- 5.7.0-RC2
- 5.7.0-RC3
- 5.7.0-RC4
- 5.7.1
- 5.7.10
- 5.7.11
- 5.7.2
- 5.7.3
- 5.7.4
- 5.7.5
- 5.7.6
- 5.7.7
- 5.7.8
- 5.7.9
- Affected ranges
- ECOSYSTEM: ≥ 5.4.0-RC1, < 5.7.12
Update to 5.7.12
Original sources
- https://github.com/contao/contao/security/advisories/GHSA-628f-v4f6-p37r
- https://github.com/contao/contao/commit/22505d5f79bc1a7f52e2cba5fddf6007e1f0408a
- https://github.com/contao/contao/releases/tag/5.3.50
- https://github.com/contao/contao/releases/tag/5.7.12
- https://nvd.nist.gov/vuln/detail/CVE-2026-107845