CVE-2026-72780
Received Received - Intake

Craft CMS Passkey Login Session Replay Vulnerability

Publication date: 2026-08-11

Last updated on: 2026-08-11

Assigner: VulnCheck

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.

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Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-72780
EUVD
EUVD-2026-56104

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
craft_cms craft_cms to 5.10.5 (exc)
craftcms craft_cms to 5.10.5 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-294 A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).

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Executive Summary

Craft CMS before version 5.10.5 has a flaw in its passkey login system where it fails to update and persist credential counters after validating WebAuthn assertions. This allows attackers to capture a valid login request and replay it to create new authenticated sessions for the victim account without proper security checks.

Detection Guidance

Monitor Craft CMS logs for repeated successful login attempts with identical request bodies containing WebAuthn requestOptions and response data. Check for multiple active sessions per user account without corresponding credential counter updates in the database.

Impact Analysis

If you use Craft CMS versions before 5.10.5, an attacker could capture your passkey login request and replay it to gain unauthorized access to your account. This could lead to data theft, unauthorized actions, or full account takeover if the request is exposed through logs or proxies.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating confidentiality requirements in GDPR and HIPAA. Organizations using affected Craft CMS versions may face compliance violations due to insufficient authentication protections.

Mitigation Strategies

Upgrade Craft CMS to version 5.10.5 or later immediately. Review and remove any stored request bodies containing WebAuthn login data from logs or debugging proxies. Implement network monitoring to detect replayed authentication requests.

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