CVE-2026-85237
8.1, highA vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perform an unrestricted number…
- CVSS
- 8.1, high high CVSS v3.1
- EPSS, next 30 days
- 0.5% higher than 38.1% of scored CVEs
- Exploitation
- No public evidence
- Published
- 3 Sept 2026a month ago
Description
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.
Details
- Vendor
- Misp
- Product
- misp
- Weakness
- CWE-307 (opens in a new tab)
- Status
- Analyzed
- Updated
- 11 Sept 2026
- Assigner
- 5a6e4751-2f3f-4070-9419-94fb35b644e8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
References 1
Patches and fixes 1
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other Misp CVEs
Every Misp CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2026-86419 MISP Exposure of Sensitive Information Vulnerability EPSS 0.4% 9.1, critical
- CVE-2026-86452 MISP Uncontrolled Resource Consumption Vulnerability EPSS 0.5% 7.5, high
- CVE-2026-85216 MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to insufficient validation of… EPSS 0.9% 9.8, critical
- CVE-2026-85221 MISP contains an improper TLS certificate validation vulnerability in CurlClient EPSS 0.3% 9.1, critical
- CVE-2026-85236 misp Cross-Site Request Forgery Vulnerability EPSS 0.3% 8.8, high
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Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.