CVE-2026-72780 Craft CMS before 5.10.5 WebAuthn Assertion Replay via login-with-passkey
Attackers can replay WebAuthn assertions to hijack user accounts in Craft CMS due to missing counter updates.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-72780?
CVE-2026-72780 is a high-severity authentication bypass vulnerability in craftcms cms, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-294
Which versions are affected by CVE-2026-72780?
2 open source packages ship an affected version, including craftcms/cms.
| Package | Affected | Fixed in |
|---|---|---|
craftcms/cms Packagist | From 5.0.0-RC1 | 5.10.5 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.10.5 |
How do I fix CVE-2026-72780?
Upgrade craftcms/cms to 5.10.5 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-72780 being exploited?
There is no known exploitation of CVE-2026-72780 in the wild and no public exploit code.
Sources
Also known as GHSA-jh4m-63fq-p9h9, GHSA-wg23-69c2-gjc8.