Authorization Bypass in Databend's Tenant Handler Component
CVE-2026-13512

5.3MEDIUM

Key Information:

Vendor

Databend

Status
Databend
Vendor
CVE Published:
28 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-13512?

A security flaw has been discovered in the Tenant Handler component of Databend, specifically within the ClientSessionManager::state_key function. This vulnerability enables unauthorized access by manipulating session states, effectively bypassing authorization checks. The issue is present in Databend versions up to 1.2.881 and can be exploited remotely, raising significant security concerns. A public exploit is available, and a pull request aimed at addressing this vulnerability is currently awaiting approval.

Affected Version(s)

Databend 1.2.881

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-13512 - Proof of Concept

References

https://vuldb.com/vuln/374520
vdb-entrytechnical-description
https://vuldb.com/vuln/374520/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-13512
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Dem000000 (VulDB User)
VulDB CNA Team
.