⚠ Reference material — not professional advice. Test in staging, back up first, verify against your specific version. Use your own judgment for your environment.
● Medium · CVSS 6.1

How to Fix CVE-2026-41255: Cross-Site Request Forgery in ckan

Other vulnerabilities in the same area that are worth patching alongside this one:

*By Sai Kiran Pandrala*

⚡ At a glance
SeverityCVSS 6.1 - Medium
Actively exploited?Not currently listed in CISA KEV
Affected>= 2.11.0, < 2.11.5, < 2.10.10
Fixed in2.10.10
Type (CWE)CWE-352: Cross-Site Request Forgery (CSRF)

What is CVE-2026-41255?

CVE-2026-41255 is a cross-site request forgery (CSRF) flaw in ckan. The product accepts state-changing requests without validating that they originated from a legitimate user session, so an attacker can trick a logged-in victim into performing privileged actions. Vendor description: CKAN is an open-source DMS (data management system) for powering data hubs and data portals. Prior to 2.10.10 and 2.11.5, Access to the views via tokens or unauthenticated requests marked the endpoint as not requiring CSRF protection.

Why this CVE matters

CSRF against an administrative endpoint converts a phishing link into a full account-state change. The vulnerability gets dangerous when chained with social engineering that lures an authenticated administrator to open the malicious URL.

For deployments of ckan that have been exposed to the public internet during the disclosure window, the operating assumption should be that scanning has already happened. Even where exploitation has not been publicly observed, scanning for the vulnerable fingerprint is cheap and routine. Patching closes the door; log review and credential rotation close out the rest of the response.

Am I affected?

You are affected if your installation matches any of these version ranges:

Check your installed version against the list above. If you cannot determine the version, treat the system as affected and follow the upgrade path below.

Open ckan's About dialog or run the vendor-documented version-check command. Compare the result against the affected ranges in the advisory.

How to fix CVE-2026-41255

  1. Read the vendor advisory in full: https://github.com/ckan/ckan/security/advisories/GHSA-mcvf-jxcw-vj73
  2. Upgrade ckan to the patched build listed in the vendor advisory.
  3. Back up the configuration (and database, where applicable) before upgrading.
  4. Apply the patch in a maintenance window. For HA pairs, upgrade the standby node first, fail over, then upgrade the former primary.
  5. Restart the affected service so the patched binary loads, then verify the new version (see verification section).

Update the Python package


# CVE-2026-41255 affects ckan >= 2.11.0, < 2.11.5. Fixed in 2.11.5.
# Vendor advisory: https://github.com/ckan/ckan/security/advisories/GHSA-mcvf-jxcw-vj73

# 1. Show the currently installed version.
python -m pip show ckan | grep -i version

# 2. Upgrade to the patched release.
python -m pip install --upgrade "ckan>=2.11.5"

# 3. For projects pinned via requirements.txt, bump the pin and re-sync.
sed -i 's/^ckan==.*/ckan==2.11.5/' requirements.txt
python -m pip install -r requirements.txt

# 4. Verify.
python -m pip show ckan | grep -i version


# Same flow on Windows.
python -m pip install --upgrade "ckan>=2.11.5"
python -m pip show ckan

Verify the fix landed


# CVE-2026-41255 verification checklist.

# 1. Confirm the running version matches 2.11.5 (replace the version probe with
#    the platform-specific command shown above).

# 2. Re-scan the host with your vulnerability scanner (Nessus, Qualys, Tenable,
#    OpenVAS, Wazuh). The scanner must no longer flag CVE-2026-41255.

# 3. Inspect recent service and kernel logs for crash-loops or rollback events.
journalctl -u <service-name> --since "10 minutes ago"
dmesg --since "10 minutes ago"

# 4. Cross-check the running build against the vendor advisory:
#    https://github.com/ckan/ckan/security/advisories/GHSA-mcvf-jxcw-vj73

If you cannot patch immediately

Require re-authentication for state-changing actions, or apply a same-site cookie policy (SameSite=Lax or Strict) on session cookies to limit cross-origin POSTs. Patch as the durable fix.

How to verify the fix worked

If your installation was internet-reachable during the disclosure window, treat log review as part of the remediation rather than an optional follow-up. Look for log entries that do not match your normal request patterns, especially repeated requests to the same uncommon endpoint, and any administrative changes you cannot tie back to a known operator.

Frequently asked questions

Is CVE-2026-41255 being exploited in the wild?

Public exploitation has not been confirmed by CISA at the time of writing. Treat the patch as time-sensitive anyway; reports often lag actual abuse.

Will a WAF or IDS rule fully mitigate CVE-2026-41255?

No. Network-layer filters can reduce noise and slow opportunistic scanners, but they will not stop a determined attacker. The vendor patch is the only durable fix.

How long should I plan for the upgrade?

Typical vendor-documented upgrade windows for ckan run from a few minutes to under an hour depending on cluster size. Test in a staging environment first and follow the vendor's documented HA upgrade order.

References

*This guide was assembled from the official vendor advisory, the NVD record, and the CISA KEV catalog entry on 2026-05-25. Always confirm against the vendor advisory before applying changes in production.*