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CVE-2026-77140

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

HIGH
8.7
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 vendorTelephone Directory

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Severity
HIGH8.7
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

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

Telephone Directory· TYPO3composer
60%
v < 4.1.15.0.0 ≤ v < 5.0.16.0.0 ≤ v < 6.2.05.0.06.0.0
Affected range stops below 4.1.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.0.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.2.0, 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-2026-018

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

8.7HIGHTYPO3
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-862CWE-639

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