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.

Attack Vector Network

Attack Complexity High

Privileges Required Low

Attack Requirements Present

User Interaction Passive

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Contao Contao unaffected
Version Status Constraints
4.6.0 affected < 5.3.54
5.4.0-RC1 affected < 5.7.17
6.0.0-RC1 affected < 6.0.6

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Contao Subscribe
Contao Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/contao/contao/blob/5.3.53/core-bundle/contao/library/Contao/User.php#L413-L446 cve-icon
https://github.com/contao/contao/commit/7618a5757347a30168139e74c7b326e3e296059d cve-icon
https://github.com/contao/contao/commit/7e7c821ce6c41c02ae85b3d9f8eff5039de3fe1e cve-icon
https://github.com/contao/contao/commit/843da308056402d94ae2dbb999959f9e2ce71fe1 cve-icon
https://github.com/contao/contao/releases/tag/5.3.54 cve-icon
https://github.com/contao/contao/releases/tag/5.7.17 cve-icon
https://github.com/contao/contao/releases/tag/6.0.6 cve-icon
https://github.com/contao/contao/security/advisories/GHSA-5mg3-mv6j-57wc cve-icon
https://www.vulncheck.com/advisories/contao-before-5.3.54-5.7.17-and-6.0.6-session-invalidation-failure-on-2fa-change cve-icon
History

Fri, 13 Nov 2026 09:45:00 +0000

Type Values Removed Values Added
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.
Title Contao before 5.3.54, 5.7.17, and 6.0.6 Session Invalidation Failure on 2FA Change
First Time appeared Contao
Contao contao
Weaknesses CWE-613
CPEs cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*
Vendors & Products Contao
Contao contao
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 2.1, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-13T09:33:39.011Z

Reserved: 2026-11-13T01:20:38.188Z

Link: CVE-2026-128335

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses