CVE-2026-77140

High

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.

SeverityHigh

CVSS8.7

Exploit probability—

Product

Extension "Telephone Directory"

PublishedAug 25, 2026

First seenAug 25, 2026

Weakness typeCWE-862Missing authorization CWE-639Authorization bypass through user-controlled key

How to fix

Update

TYPO3 Extension "Telephone Directory"6.2.0, 5.0.1, 4.1.1 or later

Vendor advisories

typo3.org/security/advisory/typo3-ext-sa-2026-018

Affected products

Product	Affected versions	Fixed in
TYPO3 Extension "Telephone Directory"	6.0.0 ≤ v < 6.2.0, 5.0.0 ≤ v < 5.0.1, v < 4.1.1	6.2.0, 5.0.1, 4.1.1

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