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CVE-2026-8427

Concretecms Concrete CMS cross-site request forgery (CSRF)

8.8 HIGHEPSS 0.20%
  1. Published21 May 2026

Description

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file removeFavoriteFolder($id). 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Concretecms Concrete CMS≥ 9.0.0 < 9.5.1

Remediation

Fixed in
Concretecms Concrete CMS≥ 9.5.1

References

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Frequently asked

Is CVE-2026-8427 being actively exploited?

CVE-2026-8427 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.20%.

How severe is CVE-2026-8427?

CVE-2026-8427 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.20% probability of exploitation.

Which products are affected by CVE-2026-8427?

Affected products include Concretecms Concrete CMS.

How do I fix CVE-2026-8427?

Upgrade affected software to a fixed version, for example Concretecms Concrete CMS 9.5.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-8427 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.