What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-09 · updated 2026-06-22
• Weakness: CWE-90

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.

Affected products

• MISP: before 2.5.36 — fixed in 2.5.36

How to fix

Upgrade to a fixed version: MISP 2.5.36. Check the vendor advisory for mitigations.

References

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

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