MISP Email OTP Race Condition Allows One-Time Password to Be Consumed by Multiple Concurrent Requests
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
CVE-2026-107276
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-107276
MISP
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"cpes": [
"cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"
],
"repo": "https://github.com/MISP/MISP",
"vendor": "MISP",
"modules": [
"UsersController (email OTP login)"
],
"product": "MISP",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.5.48",
"versionType": "semver"
}
],
"programFiles": [
"app/Controller/UsersController.php"
]
}
]- Related CVEs
- CVE-2026-107276
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #12268 · Revision 1
- Added to Heist Feed
- Publisher date