Auth bypass in Baserow
CVE-2026-18817
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."
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.2 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Baserow — versions 2.3.0, 2.3.1, 2.3.2
Weakness classification (CWE)
References
- github.com/baserow/baserow/releases/tag/2.3.3 (patch)
- CVE-2026-18817 | CVE Analysis and Report (third-party-advisory)
- Submit #857942 | baserow c34eb053be98bc0d04fcbf9b2d6b305cba0d5647 CWE-285 Improper Authorization (third-party-advisory)
- VDB-385816 | Baserow Inactive Non-Staff User serializers.py BaserowImpersonateAuthTokenSerializer improper authorization (technical-description, vdb-entry)
- VDB-385816 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-18817?
- CVE-2026-18817 is a low-severity vulnerability in Baserow, classified under Incorrect Privilege Assignment. CVSS score: 2.2/10. Published 2026-08-04.
- How severe is CVE-2026-18817?
- Low severity. CVSS v3 base score is 2.2 out of 10.