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CVE-2026-49264

6.1 medium SSVC exploitation: poc Deferred
NVD · CVE.org

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.

Fix

Microsoft's update · Moderate

  • Release Notes — azl3 python-oauthlib 3.2.2-3 on Azure Linux 3.0 · build 3.2.2-4

From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-11-01.

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 2

  1. StatusReceived → DeferredNVD modified 2026-10-16 23:17
  2. First seenCVSS 6.1NVD modified 2026-10-13 16:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 5