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CVE-2026-54361 misp CVE debrief

CVE-2026-54361 is a HIGH-severity vulnerability in MISP, a threat intelligence platform. The issue involves multiple mass assignment vulnerabilities in the handling of collections, tag collections, event delegations, and shadow attributes. These vulnerabilities could allow an authenticated attacker to craft requests containing protected fields, potentially altering object ownership, redirecting updates to another record, overwriting existing event delegation requests, or modifying shadow attribute proposals belonging to another organization.

Vendor
misp
Product
Unknown
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-15
Advisory published
2026-06-12
Advisory updated
2026-06-15

Who should care

Users of MISP, especially those with administrative access, should be aware of this vulnerability and take immediate action to patch their systems.

Technical summary

The affected components include CollectionsController::edit(), EventDelegationsController::delegateEvent(), ShadowAttributesController::edit(), TagCollectionsController::edit(), and TagCollectionsController::editWithTags(). The issue was fixed by explicitly pinning ownership and identity fields to their stored values during edit operations and by removing user-supplied primary keys from create-only save paths.

Defensive priority

High

Recommended defensive actions

  • Apply the patch as soon as possible to prevent exploitation.
  • Review and monitor MISP system logs for any suspicious activity.
  • Ensure that all MISP users have the least privileges necessary to perform their tasks.

Evidence notes

The CVE-2026-54361 vulnerability has a CVSS score of 8.8 and is considered HIGH severity. The attack requirements include authentication and access to the affected MISP endpoints, with no user interaction required.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54361 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54361

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

  • CVE-2026-54361 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54361

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

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://github.com/MISP/MISP/commit/9341690e9b6dde7f0605edea5533e05ba7362e35

    5a6e4751-2f3f-4070-9419-94fb35b644e8

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.