CVE-2026-103651
- Source
- https://cve.org/CVERecord?id=CVE-2026-103651
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103651.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-103651
- Published
- 2026-10-01T07:34:02Z
- Modified
- 2026-10-04T02:46:15Z
- Severity
-
- 7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- MISP HOTP Token Replay via Stale Session-Cached Counter Allows Second-Factor Authentication Bypass
- Details
-
MISP contains a vulnerability in its one-time password (OTP) authentication flow that allows replay of a consumed HOTP (paper) token and rewinding of the token counter.
The HOTP verification logic compared the submitted token against a counter value that was cached in the user's session at the time the password was entered, rather than against the authoritative counter stored in the database. Because the session-cached counter is not updated after a token is successfully consumed, an attacker who holds a valid session (password already submitted) can reuse a previously burned HOTP token. The stale cached counter still matches the replayed token, granting a second successful authentication and effectively rewinding the counter state.
Preconditions:
-
The target user has HOTP (paper token) second-factor authentication enabled.
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The attacker possesses a valid session in which the password step has already been completed (the OTP step is pending).
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The attacker has access to at least one HOTP token value (e.g., a paper token list).
Security impact:
-
Bypass of the second authentication factor, allowing unauthorized access to a user's MISP account.
-
Corruption of the HOTP counter state, potentially invalidating subsequent legitimate tokens or enabling further replays.
Affected versions: <2.5.48.
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- Database specific
{ "cna_assigner": "CIRCL", "cwe_ids": [ "CWE-287", "CWE-362" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103651.json" }- References