CVE-2026-77140

Broken Access Control in extension "Telephone Directory" (telephonedirectory)

Published Aug 25, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
The extension validates the HMAC of a frontend employee edit link only in the action that renders the edit form, not in the action that persists the change. An unauthenticated visitor who knows the UID of a visible employee record can send a direct POST request to the update action and overwrite that record without a valid edit link or any ownership check.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Typo3
Typo3 extension "telephone Directory"
Vendors & Products Typo3
Typo3 extension "telephone Directory"
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description The extension validates the HMAC of a frontend employee edit link only in the action that renders the edit form, not in the action that persists the change. An unauthenticated visitor who knows the UID of a visible employee record can send a direct POST request to the update action and overwrite that record without a valid edit link or any ownership check.
Title Broken Access Control in extension "Telephone Directory" (telephonedirectory)
Weaknesses CWE-639
CWE-862
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
TYPO3
Published
Updated
Aug 27, 2026, 5:33 PM
Reserved
Aug 20, 2026, 1:10 PM
Status
Deferred
Published
Aug 25, 2026, 9:17 AM
Modified
Sep 28, 2026, 11:10 PM