medium
CVE-2026-18165
@fastify/oauth2 7.2.0-8.2.0: OAuth state and PKCE verifier live in unprefixed cookies, so anyone who can write a cookie on a related host can log a victim into the ATTACKER's account (login CSRF)
- Severity
- medium
- Affected product
- @fastify/oauth2
- Affected versions
- @fastify/oauth2 ≥ 7.2.0, < 8.3.0
- Fixed in
- @fastify/oauth2 8.3.0
- Detection basis
- Component version range
- Shipped rule
- @fastify/oauth2: @fastify/oauth2 7.2.0-8.2.0: OAuth state and PKCE verifier live in unprefixed cookies, so anyone who can write a cookie on a related host can log a victim into the ATTACKER's account (login CSRF)
- Added to NewScan
- 2026-08-16
- Detected by
- NewScan — free, self-hosted
How NewScan reports it
COMPONENT VERSION RANGE
NewScan fingerprints @fastify/oauth2 from its response and reports this CVE when the detected version falls inside the affected range below.
References
Scan for this yourself — local, in-band scanning is free.
Get NewScan (FREE) →Review the measured benchmark, then use the verified remediation process.