CVE-2026-39962: MISP is an open source threat intelligence and sharing platform

Q: How do I fix CVE-2026-39962?

misp: upgrade to 2.5.36. Exact commands for each OS are on this page.

Q: Is CVE-2026-39962 being exploited?

CVE-2026-39962 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39962 affect?

CVE-2026-39962 affects misp. Severity is critical (CVSS 9.6). 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 ApacheAuth

Q: How urgent is CVE-2026-39962?

Priority 41/100. Critical severity

This month

CRITICAL 9.6UPGRADE

CVE-2026-39962 is a critical-severity flaw (CVSS 9.6) affecting misp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 a

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-90
Published	2026-04-09
Last modified	2026-06-22

Publisher (CNA): GitHub, Inc. · Vendor: misp-project

Last updated 2026-06-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 17:16 UTCPublished CVE record published
2026-06-22 19:23 UTCUpdated Record last modified

misp-project misp UPGRADE

Affected: < 2.5.36

Fixed in: 2.5.36

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy misp || rpm -q misp || misp --version

2. UPGRADE to 2.5.36 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade misp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade misp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39962?

misp: upgrade to 2.5.36. Exact commands for each OS are on this page.

Is CVE-2026-39962 being exploited?

CVE-2026-39962 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39962 affect?

CVE-2026-39962 affects misp. Severity is critical (CVSS 9.6). 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 ApacheAuth

How urgent is CVE-2026-39962?

Priority 41/100. Critical severity

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-85239 MEDIUM 6.5 UPGRADE A vulnerability in MISP's event template handling allowed an authenticated user with permission to create or m
CVE-2026-85238 MEDIUM 6.8 UPGRADE MISP contains a session fixation vulnerability in the CustomAuth authentication (a custom configuration) flow
CVE-2026-85237 HIGH 8.1 UPGRADE A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perfo
CVE-2026-85236 HIGH 8.8 UPGRADE A cross-site request forgery (CSRF) vulnerability existed in the cullEmptyEvents action of MISP
CVE-2026-85216 CRITICAL 9.8 UPGRADE MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to i

References

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