CVE-2026-85237: A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perfo

Q: How do I fix CVE-2026-85237?

misp: upgrade to newer than 2.5.45. Exact commands for each OS are on this page.

Q: Is CVE-2026-85237 being exploited?

CVE-2026-85237 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-2026-85237 affect?

CVE-2026-85237 affects misp. Severity is high (CVSS 8.1). A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perform an unrestricted number of OTP verification attempts. The email_otp() endpoint did not apply brute-force protection when valid

Routine

HIGH 8.1UPGRADE

CVE-2026-85237 is a high-severity flaw (CVSS 8.1) affecting misp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perform an unrestricted number of OTP verification attempts. The email_otp() endpoint did not apply brute-force protection when validating submitted OTP values. An attacker who had reached the OTP verification stage, for example after successfully providing a user's primary authentication credentials, could repeatedly submit candidate OTP va

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-307
Published	2026-09-03
Last modified	2026-09-11

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

Last updated 2026-09-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-03 16:18 UTCPublished CVE record published
2026-09-11 14:15 UTCUpdated Record last modified

misp-project misp UPGRADE

Affected: <= 2.5.45

Fixed in: newer than 2.5.45

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.5.45 (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-2026-85237?

misp: upgrade to newer than 2.5.45. Exact commands for each OS are on this page.

Is CVE-2026-85237 being exploited?

CVE-2026-85237 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-2026-85237 affect?

CVE-2026-85237 affects misp. Severity is high (CVSS 8.1). A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perform an unrestricted number of OTP verification attempts. The email_otp() endpoint did not apply brute-force protection when valid

How urgent is CVE-2026-85237?

Priority 38/100. High severity

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-2026-85236 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
CVE-2026-85221 CRITICAL 9.1 UPGRADE MISP contains an improper TLS certificate validation vulnerability in CurlClient

References

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