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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00292.

Exploitation none

Automatable no

Technical Impact partial

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

Vendor Product Default status Versions
TYPO3 Extension "Mask" unaffected
Version Status Constraints
9.0.0 affected < 9.0.11
0 affected < 8.3.12

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://typo3.org/security/advisory/typo3-ext-sa-2026-017 cve-icon cve-icon
History

Tue, 25 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 25 Aug 2026 09:15:00 +0000

Type Values Removed Values Added
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.
Title Path Traversal in extension "Mask" (mask)
Weaknesses CWE-22
CWE-73
References
Metrics cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: TYPO3

Published:

Updated: 2026-08-25T14:04:39.871Z

Reserved: 2026-08-20T13:10:15.962Z

Link: CVE-2026-77139

cve-icon Vulnrichment

Updated: 2026-08-25T14:04:36.776Z

cve-icon NVD

Status : Received

Published: 2026-08-25T09:17:34.647

Modified: 2026-08-25T14:16:54.937

Link: CVE-2026-77139

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-25T10:45:03Z

Weaknesses