CVE-2026-128335

Description

Contao 4.6.0 before 5.3.54, 5.4.0-RC1 before 5.7.17, and 6.0.0-RC1 before 6.0.6 fails to invalidate existing user sessions when two-factor authentication is enabled or disabled. Because Contao\User::isEqualTo() and serialized session data omit two-factor state, attackers already holding a session keep it after the owner changes 2FA settings.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 2.1CVSS 4.0, Lowfrom the CNA (VulnCheck)CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
• 3.7CVSS 3.1, Lowfrom the CNA (VulnCheck)CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 13 Nov 2026 Published

Weakness

• CWE-613

References

• GitHub Security Advisory (GHSA-5mg3-mv6j-57wc)vendor-advisory
• github.compatch
• github.compatch
• github.compatch
• Contao 5.3.54 Release Notesrelease-notes
• Contao 5.7.17 Release Notesrelease-notes
• Contao 6.0.6 Release Notesrelease-notes
• github.comtechnical-description
• VulnCheck Advisory: Contao before 5.3.54, 5.7.17, and 6.0.6 Session Invalidation Failure on 2FA Changethird-party-advisory