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CVE-2026-39962

MISP authentication bypass

9.6 CRITICALEPSS 0.66%
  1. Published9 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

MISP< 2.5.36

Remediation

Fixed in
MISP≥ 2.5.36

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1093578.1
LibreNMS before 26.9.0 contains an LDAP filter injection in ldap-authorization and…
CVE-2026-940539.1
Authentication bypass via LDAP injection in component sshd-ldap in Apache MINA SSHD…
CVE-2026-750208.1
Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')…
CVE-2026-582228.8
A security flaw combining LDAP filter injection and improper authorization checks was…
CVE-2026-473038.8
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized…
CVE-2026-42568.2
Improper neutralization of special elements used in an LDAP query ('LDAP injection')…

Frequently asked

Is CVE-2026-39962 being actively exploited?

CVE-2026-39962 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.66%.

How severe is CVE-2026-39962?

CVE-2026-39962 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 0.66% probability of exploitation.

Which products are affected by CVE-2026-39962?

Affected products include MISP.

How do I fix CVE-2026-39962?

Upgrade affected software to a fixed version, for example MISP 2.5.36 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39962 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.