CVE-2026-56383Public exploitNetwork attack vector

Stored XSS via unencoded row heading values

Published Jun 21, 2026 · Updated Jun 21, 2026

Stored XSS in Craft CMS 4.5.0-beta.1 through 4.16.18 and 5.0.0-RC1 through 5.8.22 allows remote authenticated users to execute JavaScript. Table::_getInputHtml() passes Row Heading default values to editableTable.twig without HTML encoding, so the template inserts attacker-controlled markup into the rendered field. An administrator account and enabled allowAdminChanges setting are required to store the payload, and a second user must view an object containing the table field for the script to execute in that user's browser.

CVSS severity4.6
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Craft CMS 4.5.0-beta.1 through 4.16.18 and 5.0.0-RC1 through 5.8.22 allows remote authenticated users to execute JavaScript. Table::_getInputHtml() passes Row Heading default values to editableTable.twig without HTML encoding, so the template inserts attacker-controlled markup into the rendered field. An administrator account and enabled allowAdminChanges setting are required to store the payload, and a second user must view an object containing the table field for the script to execute in that user's browser.

The record

CVE
CVE-2026-56383
Published
Jun 21, 2026
Updated
Jun 21, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 21, 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=4.5.0-beta.1 <4.16.19
  2. Affected versionversion=5.0.0-RC1 <5.8.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Pixel & Tonic · Craft CMSversion=4.5.0-beta.1 <4.16.19; version=5.0.0-RC1 <5.8.23

Published CVSS scores

4.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
4.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A: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
Privilegesadmin
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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