Cross-org deletion in a widely used threat intel platform; could disrupt security operations and data integrity across organizations.
CVE-2026-56423
MISP bulk delete bypasses per-object checks.
Is CVE-2026-56423 being exploited?
Not confirmed. CVE-2026-56423 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.47% probability of exploitation in the next 30 days.
How severe is CVE-2026-56423?
CVE-2026-56423 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-56423?
Yes. A fix has been recorded for CVE-2026-56423. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-56423 affect?
CVE-2026-56423 affects MISP Core. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-56423?
Patch immediately to enforce per-object authorization.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated broad-role user can delete event reports and sharing groups across orgs, causing data loss.
Immediate action required
- affected<= 2.5.41
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.