Vulnerability · Published Apr 9, 2026 · Assigned by GitHub_M

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

High 8.8

In plain English

A high-severity security flaw in MISP from MISP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 4.0)8.8High

Exploit odds (30 days)0.4%top 71.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
MISP	MISP	< 2.5.36

Weakness: CWE-90 · 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

References

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