CVE-2026-67335

mediumCVSS 5.3covered by 1 sourcefirst seen 2026-08-01

better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the stored nonce when using cookie-backed state storage without PKCE. Attackers can forge the state parameter and supply an attacker-controlled authorization code to create authenticated sessions bound to the attacker's external identity or persistently link attacker accounts to victim profiles.

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Advisory coverage (1)

mediumCVE-2026-67335: better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the store…nvd · 2026-08-01

External references

NVD record for CVE-2026-67335

CVE.org record

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