CVE-2026-72780: Craft CMS before 5.10.5 WebAuthn Assertion Replay via login-with-passkey

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-11 · updated 2026-10-24
Weakness: CWE-294

Description

Craft CMS before 5.10.5 fails to persist updated credential counters after WebAuthn assertion validation in the passkey login endpoint. Attackers can replay captured login request bodies containing requestOptions and response to create additional authenticated sessions for victim accounts.

Affected products

craftcms cms: from 5.0.0-RC1 before 5.10.5 — fixed in 5.10.5

How to fix

Upgrade to a fixed version: craftcms cms 5.10.5. Check the vendor advisory for mitigations.

References

https://github.com/craftcms/cms/security/advisories/GHSA-wg23-69c2-gjc8
https://www.vulncheck.com/advisories/craft-cms-before-webauthn-assertion-replay-via-login-with-passkey

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