CVE-2026-49264

OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 0.6.1 until 4.0.0, OAuthLib's RevocationEndpoint in oauthlib/oauth2/rfc6749/endpoints/revocation.py reflects an unvalidated callback request parameter into success and error response bodies when enable_jsonp=True. The callback can come from the query string or request body and is used without restricting it to a legal JavaScript function name. A browser application that loads the revocation response as trusted JSONP and permits attacker influence over callback can therefore execute attacker-controlled JavaScript in the including application's origin, with access to its DOM and script-accessible data. The feature is disabled by default, so only deployments that explicitly enable JSONP are affected. This issue is fixed in version 4.0.0.

• CWE-79

• https://github.com/oauthlib/oauthlib/commit/c888359f3c42bec235b2c5caab2069c9ed62457c
• https://github.com/oauthlib/oauthlib/pull/951
• https://github.com/oauthlib/oauthlib/releases/tag/v4.0.0
• https://github.com/oauthlib/oauthlib/security/advisories/GHSA-hj66-6f7g-4r5v
• https://github.com/oauthlib/oauthlib/security/advisories/GHSA-hj66-6f7g-4r5v

Published

Oct 13, 2026

Last Modified

Oct 16, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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