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CVE-2026-85237: misp

Severity

8.6 (HIGH)

Vendor

MISP

Affected versions

0 through 2.5.45

Patch status

Unknown

Published

2026-09-03T16:18:27.163

Modified

2026-09-03T16:45:08.223

Why it matters

This matters because the affected product may allow code execution. Prioritize systems that are internet-facing or have privileged access to other infrastructure.

Recommended admin actions

• Review and patch based on exposure, asset criticality, and business impact.
• Review logs for suspicious activity related to the affected application or component.

Technical summary

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 values while the same OTP remained valid. This significantly increased the feasibility of guessing the OTP and bypassing the additional authentication factor, potentially resulting in unauthorized access to the affected user's account. The issue was exacerbated by the fact that the OTP is associated with the user rather than with an individual pending login session, allowing multiple concurrent sessions to attempt guesses against the same valid OTP. The patch integrates the existing MISP brute-force protection mechanism into the email OTP flow. Failed OTP attempts are now counted against the user, further attempts are rejected once the configured threshold is reached, and the active OTP is invalidated when the attempt budget is exhausted. Blocklisted users are also prevented from requesting the generation of a fresh OTP. In addition, OTP comparison now uses hash_equals() and validates that the submitted value is a string.

View the official NVD record for CVE-2026-85237

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.