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CVE-2026-77139

Path Traversal in extension "Mask" (mask)

MEDIUM
6
CVSS Score
Published: August 25, 2026 at 09:00 AM UTC
Updated: September 28, 2026 at 11:10 PM UTC
1 product affected across 1 vendorMask

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Severity
MEDIUM6
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mask· TYPO3composer
60%
v < 8.3.129.0.0 ≤ v < 9.0.119.0.0
Affected range stops below 8.3.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.11, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://typo3.org/security/advisory/typo3-ext-sa-2026-017

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6MEDIUMTYPO3
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-22CWE-73

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