CVE-2026-55790Public exploitNetwork attack vector

Admin-session JavaScript execution via raw issue title

Published Jul 1, 2026 · Updated Jul 1, 2026

DOM XSS in Craft CMS 4.0.0-RC1 through 4.17.15 and 5.0.0-RC1 through 5.9.22 allows attackers to run JavaScript via issue titles. CraftSupportWidget.js passes raw GitHub API result.title text to jQuery's html option, which assigns it to innerHTML without encoding. Execution requires an administrator to return the poisoned issue in the CraftSupport Give feedback search, giving the payload the administrator's control-panel session and same-origin request authority.

CVSS severity7.4
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DOM XSS in Craft CMS 4.0.0-RC1 through 4.17.15 and 5.0.0-RC1 through 5.9.22 allows attackers to run JavaScript via issue titles. CraftSupportWidget.js passes raw GitHub API result.title text to jQuery's html option, which assigns it to innerHTML without encoding. Execution requires an administrator to return the poisoned issue in the CraftSupport Give feedback search, giving the payload the administrator's control-panel session and same-origin request authority.

The record

CVE
CVE-2026-55790
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.0.0-RC1, < 4.17.16
  2. Affected versionversion=>= 5.0.0-RC1, < 5.9.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pixel & Tonic · Craft CMSversion=>= 4.0.0-RC1, < 4.17.16; version=>= 5.0.0-RC1, < 5.9.23

Published CVSS scores

7.4GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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