Path Traversal in extension "Mask" (mask)

Answer in brief

CVE-2026-77139 records a Unknown severity vulnerability in Path Traversal in extension "Mask" (mask). The current sources do not mark it as known exploited. The current feed maps TYPO3/Extension "Mask" (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 25, 2026Source checked Aug 25, 2026First seen by HOL Aug 25, 2026Material review Aug 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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.

Affected scope and exposure questions

The current feed maps TYPO3/Extension "Mask" (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
TYPO3/Extension "Mask"generic	>=9.0.0 <9.0.11 \|\| >=0 <8.3.12	9.0.11, 8.3.12

Recommended response

Check inventory. Check lockfiles and deployed manifests for TYPO3/Extension "Mask".
Review the reported fix. Update TYPO3/Extension "Mask" to 9.0.11 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Source referencetypo3.org

Upstream source description

The extension fails to validate a client-supplied template element key before using it to build file paths for saving and deleting Mask template files. An authenticated backend user with access to the Mask module can supply a key containing path traversal sequences to create or delete .html files outside the configured template directory.

Quoted source text, attributed separately from HOL analysis.