CVE-2026-85216: MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to i

Q: How do I fix CVE-2026-85216?

misp: upgrade to 2.5.46. Exact commands for each OS are on this page.

Q: Is CVE-2026-85216 being exploited?

CVE-2026-85216 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-2026-85216 affect?

CVE-2026-85216 affects misp. Severity is critical (CVSS 9.8). MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to insufficient validation of user-supplied credentials. The custom LdapAuthenticate and LinOTPAuthenticate components replace CakePH

Q: How urgent is CVE-2026-85216?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-85216 is a critical-severity flaw (CVSS 9.8) affecting misp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to insufficient validation of user-supplied credentials. The custom LdapAuthenticate and LinOTPAuthenticate components replace CakePHP's FormAuthenticate implementation but did not replicate its credential validation checks. As a result, empty or non-string values could reach the underlying authentication mechanisms. In the LDAP authenticat

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-521
Published	2026-09-03
Last modified	2026-09-10

Publisher (CNA): CIRCL · Vendor: misp-project

Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-03 15:17 UTCPublished CVE record published
2026-09-10 19:42 UTCUpdated Record last modified

misp-project misp UPGRADE

Affected: < 2.5.46

Fixed in: 2.5.46

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.5.46 (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-2026-85216?

misp: upgrade to 2.5.46. Exact commands for each OS are on this page.

Is CVE-2026-85216 being exploited?

CVE-2026-85216 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-2026-85216 affect?

CVE-2026-85216 affects misp. Severity is critical (CVSS 9.8). MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to insufficient validation of user-supplied credentials. The custom LdapAuthenticate and LinOTPAuthenticate components replace CakePH

How urgent is CVE-2026-85216?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

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-2026-85221 CRITICAL 9.1 UPGRADE MISP contains an improper TLS certificate validation vulnerability in CurlClient

References

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