CVE-2026-81918CWE-79cross-site-scripting

CVE-2026-81918

Medium · published September 12, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
15.9
In the wild
Unconfirmed
What it is

Concrete CMS below 9.5.3 is vulnerable to Stored XSS via the Date Format field in the Page Attribute Display block. A user with edit_page_contents permissions could store a payload which executes in the browser of any visitor who viewed a page where the block was configured to display a date-type attribute. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 4.8 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Oriol Ortiz for reporting.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
4.8 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00253 · 15.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-12T01:17Z
Affected products (1)
ProductVersionsFixed in
concretecms/concrete_cms< 9.5.39.5.3
References (1)
https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes · ff5b8ace-8b95-4078-9743-eac1ca5451de
EPSS history
Timeline
  • 13 SEP 03:23Z
    EPSS moved — → 0%
    epss
  • 11 SEP 20:19Z
    Concrete CMS below 9.5.3 is vulnerable to Stored XSS via the Date Format field in the Page Attribute Display block
    cvelistv5