Is CVE-2026-8409 actively exploited?

No active exploitation of CVE-2026-8409 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8409 be exploited remotely?

Yes. CVE-2026-8409 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-8409?

CVE-2026-8409 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2026-8409

CWE-352Published: May 21, 2026· Updated: May 26, 2026

8.8

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:5.4th

Official Description

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/dialog/logs/delete. The The Concrete CMS security team gave this vulnerability a CVSS v.4.0 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 Yonatan Drori (Tenzai) for reporting.

NVD Source

Technical Analysis

CVE-2026-8409 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.