How severe is CVE-2026-39962?

CVE-2026-39962 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-39962 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39962?

CVE-2026-39962 affects Misp-project Misp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39962?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-39962 have an EU (EUVD) identifier?

Yes. CVE-2026-39962 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20966.

When was CVE-2026-39962 published?

CVE-2026-39962 was published on 2026-04-09 and last updated on 2026-06-22.

CVE-2026-39962

CVE-2026-39962 is a critical-severity vulnerability in Misp-project Misp with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-90.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v4: 8.8
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20966
Weakness: CWE-90
Affected product: Misp-project Misp
Published: 2026-04-09
Last modified: 2026-06-22

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.

Frequently asked questions

What is CVE-2026-39962?: 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.
How severe is CVE-2026-39962?: CVE-2026-39962 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-39962 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39962?: CVE-2026-39962 affects Misp-project Misp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39962?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-39962 have an EU (EUVD) identifier?: Yes. CVE-2026-39962 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20966.
When was CVE-2026-39962 published?: CVE-2026-39962 was published on 2026-04-09 and last updated on 2026-06-22.

References

Affected products (1)

cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:*

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