CVE-2026-73278

9.8 CRITICALpublic exploit available

Published 2026-10-06 · Updated 2026-10-07

AI risk analysis

Summary: The flaw allows an attacker to bypass passkey verification during OAuth2 and OpenID Connect sign-in, gaining full session access. This is critical as it undermines multi-factor authentication (MFA) and can lead to full account compromise.
Exploitability: Exploitation is relatively straightforward for an attacker who can authenticate through the affected external identity flow. The precondition is that WebAuthn is the only configured second factor.
Blast radius: If exploited, the compromise can extend beyond the initial session, potentially leading to full account takeover and data exfiltration.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Disable the affected OAuth2 and OpenID Connect sign-in paths until a patch is available or upgrade to the latest version of Gitea.

auth-bypasswebmfagitea

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

Gitea's OAuth2 and OpenID Connect sign-in paths do not require a WebAuthn challenge when WebAuthn is the account's only configured second factor. A party able to authenticate through the affected external identity flow can obtain a full session without the passkey verification enforced during password login. One affected path can also persist an external identity link, extending the compromise beyond the initial session; accounts with TOTP configured are outside the reported WebAuthn-only scenario.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-287

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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