CVE-2026-107276
MISP Email OTP Race Condition Allows One-Time Password to Be Consumed by Multiple Concurrent Requests
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 7, 2026
- Updated
- Oct 7, 2026
- Reserved
- Oct 7, 2026
Description
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:
- The target MISP instance has email OTP login enabled.
- The attacker possesses a valid, unexpired OTP (e.g., via email interception or social engineering).
- The attacker can issue two HTTP POST requests in close temporal proximity.
Impact:
- The one-time-use guarantee of the OTP is violated; a single code can yield two authenticated sessions.
- This weakens the authentication control and may facilitate unauthorized access if the OTP is shared or intercepted.
Affected versions: <2.5.48
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N | CIRCL |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
MISPMISP |
|
References
- Security patchpatch
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