Rodauth WebAuthn Login Authentication Bypass Flaw

Rodauth before 2.46.0 contains an authentication bypass vulnerability in the webauthn_login route that allows logged-in users to authenticate as any other account. Attackers can exploit improper account resolution logic that falls back to session account identifiers instead of validating the credential binding to complete authentication as arbitrary users.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

Rodauth versions prior to 2.46.0 contain a critical authentication bypass vulnerability in the webauthn_login route that allows authenticated attackers to impersonate arbitrary user accounts. The flaw stems from improper account resolution logic that incorrectly falls back to session identifiers rather than validating that WebAuthn credentials are properly bound to the target account. This vulnerability affects any application using vulnerable Rodauth versions for authentication, particularly those relying on WebAuthn as a primary or secondary authentication mechanism. With a CVSS score of 8.7, the impact is severe—attackers with valid session credentials can escalate privileges or assume control of other user accounts without possessing their actual authentication factors.

Casky's 283 mapped skills leverage Claude AI's extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&CK tactics TA0004 (Privilege Escalation) and TA0006 (Credential Access). Security practitioners using Casky would observe findings related to CWE-287 (Improper Authentication) that reveal suspicious account resolution patterns—specifically, detection of credential validation being bypassed in favor of session-based account assumption. Practitioners would see skill alerts flagging improper fallback logic in authentication flows, anomalous session-to-account mapping, and WebAuthn credential validation failures where the system accepts authentication without confirming credential-to-account binding. These findings enable teams to identify exploitation attempts and patch vulnerable Rodauth instances before attackers leverage the account impersonation capability.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-82466.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-82466

Casky has 283 skills that investigate the attack patterns behind CVE-2026-82466. Run one and get CVSS-scored findings in 3 minutes.

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