Auth bypass in Databend
CVE-2026-13512
A vulnerability was identified in Databend up to 1.2.881 on HTTP. This affects the function ClientSessionManager::state_key of the file src/query/service/src/servers/http/v1/session/client_session_manager.rs of the component Tenant Handler. The manipulation leads to authorization bypass. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The pull request to fix this issue awaits acceptance.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Databend — versions 1.2.881
Weakness classification (CWE)
References
- vuldb.com/vuln/374520 (technical-description, vdb-entry)
- vuldb.com/vuln/374520/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-13512 (third-party-advisory)
- vuldb.com/submit/838874 (third-party-advisory)
- github.com/databendlabs/databend/issues/19930 (issue-tracking, exploit)
- github.com/databendlabs/databend/pull/19931 (issue-tracking, patch)
Frequently asked questions
- What is CVE-2026-13512?
- CVE-2026-13512 is a medium-severity vulnerability in Databend, classified under Improper Authorization. CVSS score: 6.3/10. Published 2026-06-28.
- How severe is CVE-2026-13512?
- Medium severity. CVSS v3 base score is 6.3 out of 10.