PT-2026-107567 · Misp · Misp
CVSS v4.0
6.3
Medium
| Vector | AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N |
MISP contains a race condition in the email-based one-time password (OTP) login flow. When two HTTP requests carrying the same valid OTP are submitted concurrently, both can successfully authenticate and establish a session. The root cause is that the OTP value is read from the shared store, validated, and then deleted in separate non-atomic steps, allowing a second in-flight request to read the same value before the first request's deletion takes effect.
Preconditions:
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The target MISP instance has email OTP login enabled.
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The attacker possesses a valid, unexpired OTP (e.g., via email interception or social engineering).
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The attacker can issue two HTTP POST requests in close temporal proximity.
Impact:
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The one-time-use guarantee of the OTP is violated; a single code can yield two authenticated sessions.
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This weakens the authentication control and may facilitate unauthorized access if the OTP is shared or intercepted.
Affected versions: <2.5.48
Fix
Time Of Check To Time Of Use
Race Condition
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Related Identifiers
Affected Products
Misp