# CVE-2026-91198 — growthbook

> As of 2026-09-14, CVE-2026-91198 is a MEDIUM-severity vulnerability in growthbook, CVSS v3.1 5.3, EPSS 0.2% (15.7th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-91198 as of 2026-09-14; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-14

## What is CVE-2026-91198?

GrowthBook through 5.0.1 returns unredacted fact table definitions including raw warehouse SQL in payloads served by unauthenticated public report and experiment endpoints. Attackers with knowledge of a publicly shared report or experiment identifier can read internal data warehouse query text, schema, table names, filter values and datasource identifiers.

The record classifies CVE-2026-91198 under weakness class [CWE-201](https://cwe.mitre.org/data/definitions/201.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 21 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.3 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **CVSS v4.0 base score:** 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 15.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-14

## Is CVE-2026-91198 being exploited?

It currently carries a trending score of 34 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **growthbook**: growthbook

## How to fix CVE-2026-91198

No vendor patch reference has been recorded for CVE-2026-91198 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-2026-91198

No threat campaign in the Threadlinqs corpus currently references CVE-2026-91198, 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, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-09-15. This product uses the NVD API but is not endorsed or certified by the NVD.

**Technical analysis**

- [github.com — technical description](https://github.com/growthbook/growthbook/blob/57d07471b137eb43d9bfb1613d0a1203d21fef88/packages/back-end/src/services/reports.ts#L880-L890)
- [github.com — technical description (app)](https://github.com/growthbook/growthbook/blob/57d07471b137eb43d9bfb1613d0a1203d21fef88/packages/back-end/src/app.ts#L391-L409)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/growthbook-through-5.0.1-information-disclosure-via-public-endpoints)

**Issue tracking and product pages**

- [github.com — issue tracking](https://github.com/growthbook/growthbook/issues/6541)
- [github.com — product](https://github.com/growthbook/growthbook)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-91198
Full detection coverage and IOCs for threats exploiting CVE-2026-91198 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp