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CVE-2026-55790— Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget

Quick assessment

Affected
craftcms cms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CraftCMS cms是CraftCMS的内容管理系统。 CraftCMS CMS 5.0.0-RC1至5.9.22版本和4.0.0-RC1至4.17.15版本存在跨站脚本漏洞，该漏洞源于跨站脚本问题，可能导致攻击者仅需一个GitHub账户即可在问题标题中植入JavaScript有效载荷，并在管理员使用CraftSupport部件的反馈屏幕时执行。

AI Predicted 8.1 Difficulty: Easy EPSS 0.46% · P38

Affected Version Matrix 2

VendorProduct Version RangeStatus
craftcms cms >= 5.0.0-RC1, < 5.9.23 affected
>= 4.0.0-RC1, < 4.17.16 affected
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I. Basic Information for CVE-2026-55790

Vulnerability Information
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Vulnerability Title
Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
CraftCMS CMS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CraftCMS cms是CraftCMS的内容管理系统。 CraftCMS CMS 5.0.0-RC1至5.9.22版本和4.0.0-RC1至4.17.15版本存在跨站脚本漏洞，该漏洞源于跨站脚本问题，可能导致攻击者仅需一个GitHub账户即可在问题标题中植入JavaScript有效载荷，并在管理员使用CraftSupport部件的反馈屏幕时执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms >= 5.0.0-RC1, < 5.9.23 -

II. Public POCs for CVE-2026-55790

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III. Intelligence Information for CVE-2026-55790

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Patches & Fixes for CVE-2026-55790 (1)

Vendor Advisories for CVE-2026-55790 (1)

Same Patch Batch · craftcms · 2026-07-01 · 9 CVEs total

CVE-2026-50284 Craft CMS: Missing peer-permission check in `AssetsController::actionDeleteFolder` allows
CVE-2026-50280 Craft CMS: Authorization bypass in `entries/move-to-section` via missing target-section sa
CVE-2026-50279 Craft CMS: Authorship spoofing in `entries/save-entry` via pre-check/post-mutation authori
CVE-2026-50283 Craft CMS: Unauthorized Deletion of Source Assets During File Replacement
CVE-2026-55793 Craft CMS: Stored XSS via Structure entry title in table view
CVE-2026-55792 Craft CMS: Sensitive File Disclosure / Server-Side File Read
CVE-2026-55791 Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in acti
CVE-2026-55794 Craft CMS: Potential authenticated Remote Code Execution via referrer redirect

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-79

V. Comments for CVE-2026-55790

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