TI-2026-40276 Aliases CVE-2026-55790 GHSA-24x4-j6x9-rfw5

Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget

LOW 33CWE-79Published 2026-07-01 · Updated 2026-07-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: Active
Attack complexity: Low
Attack requirements: Present
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00461 40th percentileScored 2026-11-07

Fix Fixed cms (craftcms): 5.9.23, 4.17.16craftcms/cms (Packagist): 5.9.23, 4.17.16

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Craft CMS	cms	5.0.0-RC1 to before 5.9.23; 4.0.0-RC1 to before 4.17.16	5.9.23, 4.17.16	Patch available	CNA
—	craftcms/cms (Packagist)	5.0.0-RC1 to before 5.9.23	5.9.23	Patch available	GHSA-24x4-j6x9-rfw5
—	craftcms/cms (Packagist)	4.0.0-RC1 to before 4.17.16	4.17.16	Patch available	GHSA-24x4-j6x9-rfw5

cms VendorCraft CMS Affected 5.0.0-RC1 to before 5.9.23; 4.0.0-RC1 to before 4.17.16 Fixed in 5.9.23, 4.17.16 Patch available CNA
craftcms/cms (Packagist) Vendor— Affected 5.0.0-RC1 to before 5.9.23 Fixed in 5.9.23 Patch available GHSA-24x4-j6x9-rfw5
craftcms/cms (Packagist) Vendor— Affected 4.0.0-RC1 to before 4.17.16 Fixed in 4.17.16 Patch available GHSA-24x4-j6x9-rfw5

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:craftcms:craft_cms::::::::	—	—	Craft CMS

cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:* Versions — — ·Craft CMS

Remediation

Fix · CNA cms (craftcms) Fixed in 5.9.23, 4.17.16
Fix · GHSA-24x4-j6x9-rfw5 craftcms/cms (Packagist) Fixed in 5.9.23 Advisory →
Fix · GHSA-24x4-j6x9-rfw5 craftcms/cms (Packagist) Fixed in 4.17.16 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-55790
2026-10-03 Alias added: GHSA-24x4-j6x9-rfw5

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-55790

Other 3

TI-2025-23503 Craft CMS Allows Remote Code Execution KEVCVSS 3.1CRITICAL 10.0
TI-2024-37138 RCE when PHP `register_argc_argv` config setting is enabled in craftcms/cms KEVCVSS 4.0CRITICAL 9.3
TI-2025-16994 Potential RCE with a compromised security key in craft/cms KEVCVSS 3.1HIGH 8.1
TI-2025-24595 Craft CMS stores user-provided content in session files KEVCVSS 4.0MEDIUM 6.9
TI-2023-22284 Craft CMS Remote Code Execution vulnerability CVSS 3.1CRITICAL 10.0
TI-2024-25171 Craft CMS up to v3.7.31 was discovered to contain a SQL injection vulnerability via the GraphQL API endpoint. CVSS 3.1CRITICAL 9.8

See all 203 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences