CVE-2026-77140

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

State: Published
Severity: 8.7 High
Published: Aug 25, 2026
Updated: Aug 27, 2026
Reserved: Aug 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	TYPO3

Weaknesses

CWE-862 Missing Authorization
CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
Extension "Telephone Directory"TYPO3	6.0.0 to before 6.2.0Affected 5.0.0 to before 5.0.1Affected before 4.1.1Affected

References

https://typo3.org/security/advisory/typo3-ext-sa-2026-018vendor-advisory

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