CKAN has CSRF exemption primed by anonymous requests

CVE-2026-41255 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Views can be marked as exempt from CSRF protection

Access to the views via tokens or unauthenticated requests marked the endpoint as not requiring CSRF protection.

The marking was a member variable in flask-wtf.csrf.CSRFProtect(), which was stored as a module level variable in the flask_app middleware. Thsi API was never intended for request level changes, it is primarily a decorator for static configuration.

An unauthenticated request could hit a protected endpoint, exempting it from CSRF protection for the life of the particular server process. (e.g. one worker of uwsgi).

This could be leveraged with XSS to perform actions using other user's credentials.

References

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-04-29 20:36:07 UTC
Updated
2026-05-14 20:39:45 UTC
GitHub reviewed
2026-04-29 20:36:07 UTC
NVD published
2026-05-13

EPSS Score

Score Percentile
0.01% 2.00%

CVSS Scores

Base score Version Severity Vector
6.1 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

Type Value
GHSA GHSA-mcvf-jxcw-vj73 ↗
CVE CVE-2026-41255 ↗

CWEs

CWE id Name
CWE-352 Cross-Site Request Forgery (CSRF)

Credits

  • Shirshaw64p (reporter)

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
pip ckan >= 2.10.0, < 2.10.10 2.10.10 —
pip ckan >= 2.11.0, <= 2.11.4 2.11.5 —

References

cvelogic Threat Intelligence