6.1

CVE-2026-49264: oauthlib Cross-site Scripting

CVSS: 6.1v3.1MediumDeferred
AliasesGHSA-hj66-6f7g-4r5vPYSEC-2026-4113CGA-28gf-9748-whq6
Published 13-10-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-49264 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in oauthlib. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22.8% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.31%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
SUSE-SU-2026:24139-1

Timeline

  1. 13-10-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

14-10-202619-10-2026
EPSS score
0.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard83 products
  • airflow-2All versions (No fix recorded)
  • ansible-operator< 1.42.3-r18
  • ansible-operator-fips< 1.42.3-r15
  • authentik-2025.12All versions (No fix recorded)
  • authentik-2026.2All versions (No fix recorded)
Wolfi17 products
  • az< 2.90.0-r2
  • dask-kubernetes< 2026.3.0-r15
  • datadog-agent-7.77-core-integrationsAll versions (No fix recorded)
  • datadog-agent-7.78-core-integrationsAll versions (No fix recorded)
  • datadog-agent-7.79-core-integrationsAll versions (No fix recorded)
Debian1 product
  • python-oauthlibAll versions (No fix recorded)
Oauthlib1 product
Opensuse1 product
  • python-oauthlib&distro=openSUSE Tumbleweed< 4.0.0-1.1
PyPI1 product
  • oauthlib≥ 0.6.1, < 4.0.0
Ubuntu1 product
  • python-oauthlibAll versions (No fix recorded)

7 vendors · 105 products

References

13 links
Show all 13 references