# CVE-2026-55790 — craftcms cms

> As of 2026-07-01, CVE-2026-55790 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in craftcms cms, CVSS v4.0 7.4, EPSS 0.3% (22.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-55790 as of 2026-07-01; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-01

## What is CVE-2026-55790?

Craft CMS is a content management system (CMS). In versions 5.0.0-RC1 through 5.9.22 and 4.0.0-RC1 through 4.17.15, an attacker with only a GitHub account can plant a JavaScript payload in a craftcms/cms issue title. When a Craft admin uses the CraftSupport widget’s "Give feedback" screen and types a search term that returns the poisoned issue, the payload executes in the admin’s control panel session. No control panel account or elevated privileges are required on the attacker’s side. This issue has been fixed in versions 4.17.16 and 5.9.23.

The record classifies CVE-2026-55790 under weakness class [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 96 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 7.4 — High (derived from score) (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 22.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-01

## Is CVE-2026-55790 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

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

## How to fix CVE-2026-55790

No vendor patch reference has been recorded for CVE-2026-55790 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-2026-55790

No threat campaign in the Threadlinqs corpus currently references CVE-2026-55790, 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 2026-07-02. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/craftcms/cms/security/advisories/GHSA-24x4-j6x9-rfw5)

**Other references**

- [github.com](https://github.com/craftcms/cms/commit/6bbb66038a268552180ca5c8eed9f46ea25a4417)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-55790
Full detection coverage and IOCs for threats exploiting CVE-2026-55790 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp