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VulnerabilityCVE-2026-56393Published 2026-06-21

CVE-2026-56393 — craftcms cms

medium

As of 2026-06-22, CVE-2026-56393 is a MEDIUM-severity vulnerability in craftcms cms, CVSS v3.1 4.8. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-56393 as of 2026-06-22; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v3.1
4.8/10Medium
EPSS
—No EPSS score yet
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
2.4/10Threadlinqs triage score
Published
Updated 2026-06-22
CVSS v3.1 4.8 (MEDIUM) · CVSS v4.0 4.6 · Priority 2.4/10 · Published 2026-06-21

Last updated:

What is CVE-2026-56393?

Craft CMS 4.x (>= 4.0.0-RC1, = 5.0.0-RC1, < 5.9.0-beta.1) contain multiple stored cross-site scripting vulnerabilities where settings names and field option labels are rendered without sanitization (e.g., via the checkbox.twig template, which used {{ label|raw }}). An authenticated administrator (with allowAdminChanges enabled) can inject malicious payloads into section names, volume names, user group names, global set names, generated field names, checkbox/radio option labels, and custom source labels, causing arbitrary JavaScript to execute in other users' control-panel sessions. Fixed in 4.17.0-beta.1 and 5.9.0-beta.1.

The record classifies CVE-2026-56393 under weakness class CWE-79. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs high-privilege credentials, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 106 days ago.

Severity and exploitation probability

CVSS v3.1 base score
4.8 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0 base score
4.6
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
2.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-21, last modified 2026-06-22

Is CVE-2026-56393 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-56393

No vendor patch reference has been recorded for CVE-2026-56393 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-2026-56393

No threat campaign in the Threadlinqs corpus currently references CVE-2026-56393, 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, GitHub Security Advisories. Last verified by Threadlinqs on .

Vendor advisory and patch

Third-party advisory