CVE-2026-18972
Authenticated gRPC header spoofing enables GUI account takeover to admin
Is CVE-2026-18972 being exploited?
Not confirmed. CVE-2026-18972 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 6.1% probability of exploitation in the next 30 days.
How severe is CVE-2026-18972?
CVE-2026-18972 is rated Critical with a CVSS score of 9.6. 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-2026-18972?
Yes. A fix has been recorded for CVE-2026-18972. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-18972 affect?
CVE-2026-18972 affects gRPC-based GUI services, Applications accepting Grpc-Metadata-USER header, Internal admin interfaces using gRPC. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18972?
Validate/ignore client-supplied Grpc-Metadata-USER server-side; enforce auth checks; patch when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker spoofs Grpc-Metadata-USER to impersonate users, escalate from low privilege to admin and gain full account control.
Immediate action required
- affected< 0.77.2
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.