SEPTEMBER 17, 2026
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Case File

CVE-2026-81920

LOW · CVSS 2.3 EPSS 0.19%

Source: NVD + CISA KEV + EPSS · Published 2026-09-15 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

Concrete CMS versions prior to 9.5.3 are susceptible to Cross-Site Request Forgery (CSRF) on the dashboard's SEO Excluded Words page, allowing attackers to manipulate the reserved-word list without proper validation. This vulnerability can lead to unauthorized changes in URL-slug generation, potentially undermining the site's SEO configuration. Administrators and security teams managing Concrete CMS installations should prioritize patching to mitigate this risk.

CVE
CVE-2026-81920
Severity
LOW
CVSS
2.3
EPSS
0.19%

Original NVD Description

Concrete CMS below 9.5.3 was vulnerable to Cross-Site Request Forgery in the dashboard SEO Excluded Words page. The reset() controller action cleared the administrator-configured reserved-word list (concrete.seo.exclude_words) but did not validate the anti-CSRF token that the reset modal emitted, and it did not restrict the request to the POST method. A remote attacker who lured an authenticated user with SEO access to a crafted page could revert the reserved-word list to its default and silently alter future URL-slug generation for pages, files, topics, and other objects created through the Text urlify service, undoing the site's configured SEO slug policy. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.