CVE-2026-39962

Name: CVE-2026-39962
Creator: NVD / NIST
Published: 2026-04-09T17:16:30.6+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.34%

Last modified Jun 22, 2026

CVE-2026-39962 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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). EPSS estimates a 0.34% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS 4.0

8.8/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.34%

26.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-90

Affected Software

Vendor	Product	Versions
Misp-Project	Misp	< 2.5.36

References

https://github.com/MISP/MISP/commit/380ee4136a7d9ce2fe63fce06d517839f30aba10Patch
https://github.com/MISP/MISP/commit/d7d671ea8f5822e91207dcad2003c35c30092a32Patch
https://github.com/MISP/MISP/releases/tag/v2.5.36Product, Release Notes
https://github.com/MISP/MISP/security/advisories/GHSA-mc53-48w8-9g63Vendor Advisory

Timeline

Published: Apr 9, 2026
Last Modified: Jun 22, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-39962?

How severe is CVE-2026-39962?

CVE-2026-39962 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2026-39962?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-39962?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST