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CVE-2026-18119

9.0 CRITICALEPSS 0.31%
  1. Published14 Sept 2026

Description

Concrete CMS below 9.5.3 did not sanitize custom style values in the Block Design dialog before writing them into page CSS via a DOM sink, permitting stored cross-site scripting. An editor-level user could execute script in an administrator's session and escalate privileges. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.0 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Nguyen Manh Thuan for reporting.

CVSS 3.1 breakdown

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

Affected products

Concretecms Concrete Cms< 9.5.3

Remediation

Fixed in
Concretecms Concrete Cms≥ 9.5.3

References

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Frequently asked

Is CVE-2026-18119 being actively exploited?

CVE-2026-18119 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.31%.

How severe is CVE-2026-18119?

CVE-2026-18119 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.31% probability of exploitation.

Which products are affected by CVE-2026-18119?

Affected products include Concretecms Concrete Cms.

How do I fix CVE-2026-18119?

Upgrade affected software to a fixed version, for example Concretecms Concrete Cms 9.5.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-18119 against the real software inventory on every managed device, every day. 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.