# CVE-2026-92592 — craftcms cms

> As of 2026-09-17, CVE-2026-92592 is a HIGH-severity vulnerability in craftcms cms, CVSS v3.1 8.8. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-92592 as of 2026-09-17; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-17

## What is CVE-2026-92592?

Craft CMS 4.8.0 through 4.18.5 and 5.0.0 through 5.10.12 sign an authenticated user's attacker-controlled license-shun cookie with the same key and format used to validate signed redirect parameters, because the HMAC signature is not bound to its purpose (Yii's cookieValidationKey is derived from the same Craft securityKey used for signed request parameters). An authenticated, non-administrator user (Control Panel access is not required) can set the cookie via the license-shun endpoint and transplant the signed envelope into the redirect parameter; on a successful login, Craft validates the signature and renders the authenticated bytes as an unsandboxed Twig template, where Twig's map filter accepts a string callback and allows PHP system() to execute arbitrary operating-system commands as the web-server user. Exploitation requires an account using password authentication without active 2FA, the default request configuration, and availability of PHP system(). The issue is fixed in 4.18.6 and 5.10.13.

The record classifies CVE-2026-92592 under weakness class [CWE-1336](https://intel.threadlinqs.com/cwe/CWE-1336). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 19 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **CVSS v4.0 base score:** 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-16, last modified 2026-09-17

## Is CVE-2026-92592 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [craftcms](https://intel.threadlinqs.com/vendors/craftcms): cms

## How to fix CVE-2026-92592

No vendor patch reference has been recorded for CVE-2026-92592 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-2026-92592

No threat campaign in the Threadlinqs corpus currently references CVE-2026-92592, 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. Last verified by Threadlinqs on 2026-09-17. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/craftcms/cms/security/advisories/GHSA-5r92-75j8-c534)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/craft-cms-before-4.18.6-remote-code-execution-via-signed-cookie)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-92592
Full detection coverage and IOCs for threats exploiting CVE-2026-92592 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp