CVE-2026-18817 Baserow Inactive Non-Staff User serializers.py BaserowImpersonateAuthTokenSerializer improper authorization
Attackers can obtain authentication tokens for inactive users, bypassing authorization checks, though actual endpoint access remains restricted.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18817?
CVE-2026-18817 is a low-severity missing authorization vulnerability in Baserow, published on 4 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A security flaw has been discovered in Baserow up to 2.3.2. Affected by this issue is the function BaserowImpersonateAuthTokenSerializer of the file backend/src/baserow/api/admin/users/serializers.py of the component Inactive Non-Staff User Handler. Performing a manipulation results in improper authorization. Remote exploitation of the attack is possible. The complexity of an attack is rather high. The exploitation is known to be difficult. The presence of this vulnerability remains uncertain at this time. Upgrading to version 2.3.3 can resolve this issue. The affected component should be upgraded. The project maintainer explains: "While the problem exists, I'm not really sure if it's a vulnerability. (....) Even though the back gives a token for a deactivate user, none of the endpoints actually work. That said, we will fix it, but so far it seems more like a bug instead of a vulnerability."
Which versions are affected by CVE-2026-18817?
How do I fix CVE-2026-18817?
No fix has been published for CVE-2026-18817 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-18817 being exploited?
There is no known exploitation of CVE-2026-18817 in the wild and no public exploit code.
Sources
Also known as GHSA-2h3m-r6q7-49xm.