Cross-site scripting in oauthlib - CVE-2026-49264
Published: September 28, 2026
Vulnerability identifier: #VU152411
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-49264
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary JavaScript in a client application's origin.
The vulnerability exists due to improper neutralization of input during web page generation in the RevocationEndpoint when processing JSONP revocation requests with attacker-controlled callback parameters. A remote attacker can supply a crafted callback parameter to execute arbitrary JavaScript in a client application's origin.
The JSONP feature is disabled by default and exploitation requires a browser page to load the response as JSONP.
Affected software
oauthlib
How to mitigate CVE-2026-49264
Install security update from vendor's website.
oauthlib - update to 3.3.2