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Mon, 17 Aug 2026 20:30:00 +0000
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| Metrics |
ssvc
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Mon, 17 Aug 2026 11:30:00 +0000
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| First Time appeared |
Fastify
Fastify oauth2 |
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| Vendors & Products |
Fastify
Fastify oauth2 |
Sat, 15 Aug 2026 14:00:00 +0000
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| Description | @fastify/oauth2 is an OAuth 2.0 plugin for Fastify. In versions from 7.2.0 up to but not including 8.3.0, the plugin validates the OAuth state, and with PKCE the code verifier, by comparing the callback query parameter against an unprefixed, predictable cookie, with no server-side binding to the browser that began the flow. Any party able to write a cookie for the application's host, such as a sibling subdomain under the same registrable domain, can plant matching state and verifier cookies and complete an attacker-owned OAuth flow inside a victim's browser, silently signing the victim in to the attacker's account (login CSRF). It does not expose the victim's own account, credentials, or tokens. The issue is fixed in @fastify/oauth2 8.3.0, which adds an opt-in hostPrefixedCookies option. Users should upgrade to 8.3.0 and enable it, or bind state to a server-side session. | |
| Title | @fastify/oauth2 vulnerable to Login CSRF via plantable OAuth state cookies | |
| Weaknesses | CWE-352 | |
| References |
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| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: openjs
Published:
Updated: 2026-08-17T19:41:55.649Z
Reserved: 2026-07-28T20:21:36.198Z
Link: CVE-2026-18165
Updated: 2026-08-17T19:41:49.769Z
Status : Received
Published: 2026-08-15T14:17:07.290
Modified: 2026-08-17T20:16:41.040
Link: CVE-2026-18165
No data.
OpenCVE Enrichment
Updated: 2026-08-17T10:59:23Z