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MispApplication · Misp Project

CVE-2026-39962

CRITICAL · 9.6 CVSS v3.1 Published 2026-04-09
Fix available
A fix is available. Upgrade to 2.5.36 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
MispApplication
Affected:< 2.5.36

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 2.5.36 or later
Fixed in 2.5.36
Vendor patch github.com →
Recommended fix High confidence

2.5.36

  1. 1. Backup your current MISP installation and database before proceeding.
  2. 2. Navigate to your MISP directory: cd /var/www/MISP (or your installation path).
  3. 3. Update MISP to version 2.5.36 or later using your preferred method (e.g., git pull, package manager).
  4. 4. If using git: run 'git fetch origin' followed by 'git checkout 2.5.36' or 'git pull origin 2.5.36'.
  5. 5. Verify the fix by checking that ApacheAuthenticate.php contains the patched code from commit 380ee4136a7d9ce2fe63fce06d517839f30aba10.
  6. 6. Clear any caches: cd app && bin/cake cache clear_all.
  7. 7. Test authentication functionality, especially if using ApacheAuthenticate with custom apacheEnv settings.
  8. 8. Ensure your web server is restarted after the update.
Caveat Review release notes for 2.5.36 to check for any breaking changes compared to your current version; test in staging before production deployment.

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $2,300. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-39962 in production — separate from our analysis above.

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