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CVE-2026-67336 is a vulnerability in better-auth versions prior to 1.6.11 caused by insecure cryptographic defaults in the oidcProvider and mcp plugins. The affected components advertise the "none" algorithm and accept plain PKCE by default. These defaults weaken the security guarantees expected in OIDC and OAuth-style authorization flows by permitting unsafe algorithm negotiation and use of a weaker PKCE mode instead of S256. As a result, an attacker may be able to induce acceptance of unsigned tokens or exploit authorization flows that rely on plain PKCE, undermining token integrity and authorization code protection.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.