MISP up to 2.5.35 ApacheAuthenticate.php Username ldap injection

Summaryinfo

A vulnerability classified as critical was found in MISP up to 2.5.35. This affects an unknown part of the file ApacheAuthenticate.php. The manipulation of the argument Username results in ldap injection. This vulnerability is reported as CVE-2026-39962. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in MISP up to 2.5.35. It has been classified as critical. Affected is an unknown function of the file ApacheAuthenticate.php. The manipulation of the argument username with an unknown input leads to a ldap injection vulnerability. CWE is classifying the issue as CWE-90. The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-39962 since 04/08/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1505 by the MITRE ATT&CK project.

By approaching the search of inurl:ApacheAuthenticate.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.5.36 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 380ee4136a7d9ce2fe63fce06d517839f30aba10 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• MISP

Version

• 2.5.0
• 2.5.1
• 2.5.2
• 2.5.3
• 2.5.4
• 2.5.5
• 2.5.6
• 2.5.7
• 2.5.8
• 2.5.9
• 2.5.10
• 2.5.11
• 2.5.12
• 2.5.13
• 2.5.14
• 2.5.15
• 2.5.16
• 2.5.17
• 2.5.18
• 2.5.19
• 2.5.20
• 2.5.21
• 2.5.22
• 2.5.23
• 2.5.24
• 2.5.25
• 2.5.26
• 2.5.27
• 2.5.28
• 2.5.29
• 2.5.30
• 2.5.31
• 2.5.32
• 2.5.33
• 2.5.34
• 2.5.35

License

• open-source

Website

• Product: https://github.com/MISP/MISP/

CPE 2.3info

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CPE 2.2info

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