PT-2026-22865 · Unknown · Concrete Cms

Minhnn42 + 2 · CVE-2026-3240 · Published 2026-03-04 · Updated 2026-03-04

Positive Technologies (AI Summary)

CVSS v4.0

4.8

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.4.8

Description A user with edit permissions on a page containing a Legacy form can execute a stored Cross-Site Scripting (XSS) attack targeting high-privilege accounts through the Question field. This allows an attacker to inject malicious scripts that execute within the context of another user's browser.

Recommendations Update to version 9.4.8 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-3240

GHSA-45FJ-FVMM-XCC5

Affected Products

Concrete Cms

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3240.json · Exploit
• https://github.com/concretecms/concretecms/pull/12826 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3240 · Security Note
• https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-45fj-fvmm-xcc5 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-3240 · Vendor Advisory
• https://github.com/concretecms/concretecms · Note
• https://twitter.com/cyberbivash/status/2029061299716407355 · Twitter Post
• https://t.me/CVEtracker/46274 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2029190442512687290 · Twitter Post
• https://twitter.com/CVEarity/status/2029168772498768080 · Twitter Post