CVE-2026-53947

mediumCVSS 5.3covered by 1 sourcefirst seen 2026-08-04

Impact A discrepancy in responses from the members signin endpoints made it possible for an unauthenticated attacker to determine whether a given email address belongs to a registered member of a Ghost site. Vulnerable versions This vulnerability is present in Ghost from v5.18.0 up to v6.21.0. Patches v6.21.1 contains a fix for this issue. How to update For self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here. If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here. For more information If you have any questions or comments about this advisory, email Ghost at security@ghost.org.

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Exploitation outlook

Low exploitation risk0.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumGHSA-chgm-3698-jm42: Ghost: Member existence leak via magic link sign-in responseghsa · 2026-08-04

External references

NVD record for CVE-2026-53947

CVE.org record

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