Vulnerability details
CVE-2026-77140
TYPO3 Extension "Telephone Directory"
Broken Access Control in extension "Telephone Directory" (telephonedirectory)
CVSS 4.0
8.7High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (TYPO3) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| TYPO3 | Extension "Telephone Directory" | v < 4.1.1 | CVEProject cvelistV5 (CNA) |
| TYPO3 | Extension "Telephone Directory" | 5.0.0 ≤ v < 5.0.1 | CVEProject cvelistV5 (CNA) |
| TYPO3 | Extension "Telephone Directory" | 6.0.0 ≤ v < 6.2.0 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://typo3.org/security/advisory/typo3-ext-sa-2026-018 vendor-advisory
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Details
- Published
- 2026-08-25
- Last updated
- 2026-08-27
- State
- Published
- Assigner (CNA)
- TYPO3
Exploit prediction (EPSS)
0.4%
Probability of exploitation in 30 days
35%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-862Missing Authorization
- CWE-639Authorization Bypass Through User-Controlled Key