Answer in brief
CVE-2026-128335 records a Low severity (CVSS 2.1) vulnerability in Contao before 5.3.54, 5.7.17, and 6.0.6 Session Invalidation Failure on 2FA Change. The current sources do not mark it as known exploited. The current feed maps Contao/Contao (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 2.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Contao/Contao (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Contao/Contaogeneric | >=4.6.0 <5.3.54 || >=5.4.0-RC1 <5.7.17 || >=6.0.0-RC1 <6.0.6 | 5.3.54, 5.7.17, 6.0.6 |
Published upstream
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 13, 2026
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.
Quoted source text, attributed separately from HOL analysis.