PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-107276 MISP CVE debrief

CVE-2026-107276 debrief: MISP Email OTP Race Condition Allows One-Time Password to Be Consumed by Multiple Concurrent Requests. This vulnerability exists in the email-based one-time password (OTP) login flow of MISP. 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.

Vendor
MISP
Product
Unknown
CVSS
MEDIUM 6.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-07
Original CVE updated
2026-10-07
Advisory published
2026-10-07
Advisory updated
2026-10-07

Who should care

Defenders responsible for MISP instance security and administrators of MISP instances with email OTP login enabled should assess exposure and apply the security patch. They should review MISP instance configurations, monitor logs for suspicious activity, and ensure proper security measures are in place.

Why it matters

Defenders should prioritize verifying and applying the security patch to prevent unauthorized access via the email OTP login flow, as the vulnerability weakens authentication control and may facilitate unauthorized access.

  • Violates the one-time-use guarantee of the OTP, allowing a single code to yield two authenticated sessions.
  • Weakens the authentication control, potentially facilitating unauthorized access if the OTP is shared or intercepted.
  • Requires verification of MISP instance configurations and email OTP login flow security.

Technical summary

MISP contains a race condition in the email-based one-time password (OTP) login flow, allowing multiple concurrent requests to consume the same OTP. The vulnerability arises from non-atomic steps in reading, validating, and deleting the OTP value from a shared store. This weakness may facilitate unauthorized access if the OTP is shared or intercepted. Affected versions are <2.5.48. Defenders should prioritize verifying and applying the security patch (version 2.5.48 or later). The CVE record and source item provide details on the vulnerability, including its impact and affected versions.

Defensive priority

Defenders should prioritize verifying and applying the security patch (version 2.5.48 or later) to prevent unauthorized access via the email OTP login flow.

Recommended defensive actions

  • Verify and apply the security patch (version 2.5.48 or later) to prevent unauthorized access via the email OTP login flow.
  • Review and update MISP instance configurations to ensure email OTP login is properly secured.
  • Monitor MISP instance logs for suspicious login activity.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the MISP email OTP race condition vulnerability, including its impact and affected versions (<2.5.48). Defenders should verify MISP instance configurations and email OTP login flow security. The CVE Program record (cve-org) and NIST NVD detail page (nvd) offer additional context. Source item (source-item) and patch reference (ref-4) provide further information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-107276 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-107276

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-107276 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-107276

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.