# CVE-2026-13512 — Databend

> As of 2026-06-28, CVE-2026-13512 is a MEDIUM-severity vulnerability in Databend, CVSS v3.1 6.3, EPSS 0.2% (12.4th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-13512 as of 2026-06-28; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-06-28

## What is 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.

The record classifies CVE-2026-13512 under weakness classes [CWE-639](https://intel.threadlinqs.com/cwe/CWE-639), [CWE-285](https://intel.threadlinqs.com/cwe/CWE-285). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 99 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.3 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 12.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-28

## Is CVE-2026-13512 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **(vendor unspecified)**: Databend

## How to fix CVE-2026-13512

No vendor patch reference has been recorded for CVE-2026-13512 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-13512

No threat campaign in the Threadlinqs corpus currently references CVE-2026-13512, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-06-30.

**Vendor advisory and patch**

- [github.com — issue tracking](https://github.com/databendlabs/databend/pull/19931)

**Exploit and proof of concept**

- [github.com — exploit](https://github.com/databendlabs/databend/issues/19930)

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/374520)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/374520/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-13512)
- [vuldb.com — third party advisory (838874)](https://vuldb.com/submit/838874)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-13512
Full detection coverage and IOCs for threats exploiting CVE-2026-13512 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp