THREATOPS

THREAT OPS › Threat News › [GHSA] GHSA-p378-jp5r-gpgw (medium) — arc has unauthenticated cluster node admission when `cluster.shared_secret` is unset

[GHSA] GHSA-p378-jp5r-gpgw (medium) — arc has unauthenticated cluster node admission when `cluster.shared_secret` is unset

medgithub_advisoriesPublished 2026-08-28

GHSA-p378-jp5r-gpgw Severity: medium CVE: CVE-2026-55678

arc has unauthenticated cluster node admission when `cluster.shared_secret` is unset

## Summary

Arc Enterprise clustering accepts cluster join requests without authentication when `cluster.enabled=true` but `cluster.shared_secret` is not configured. The coordinator validates HMAC authentication only if a shared secret is non-empty; otherw

Indicators of compromise

CVE-2026-55678cve

Original source: https://github.com/advisories/GHSA-p378-jp5r-gpgw