CVE-2026-49264
Published:September 29, 2026
Updated:October 01, 2026
When "enable_jsonp=True", oauthlib's "RevocationEndpoint" reflects the user-supplied "callback" parameter directly into JavaScript response bodies on both success and error paths without validating that it is a legal JSONP callback name. This allows arbitrary JavaScript response generation instead of a restricted function call, making the documented JSONP revocation feature unsafe for browser-based JSONP consumption when attackers can influence "callback".
Affected Packages
oauthlib (CONDA):
Affected version(s) >=1.1.2 <4.0.0Fix Suggestion:
Update to version 4.0.0https://github.com/oauthlib/oauthlib.git (GITHUB):
Affected version(s) >=v1.1.2 <v4.0.0Fix Suggestion:
Update to version v4.0.0oauthlib (PYTHON):
Affected version(s) >=0.6.1 <4.0.0Fix Suggestion:
Update to version 4.0.0Related Resources (7)
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Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')