CVE-2026-18422 Details
Concrete CMS before 9.5.3 did not enforce a destination-side authorization check and did not validate a CSRF token in the multilingual page assignment backend action (Backend\Page\Multilingual::assign). As a result, an authenticated user who held the Edit Page Multilingual Settings permission on a single page could bind an arbitrary page in another locale as that source page's translation, and could delete legitimate translation pairs maintained by other editors, altering public-facing language routing across the site. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.
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Exploit prediction scoring system (EPSS) score for CVE-2026-18422
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.48 Probability of exploitation activity being observed over the next 30 days (41th percentile)
CVSS score for CVE-2026-18422
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
6.5 Medium
Products affected by CVE-2026-18422
ConcreteCMS 5.4.1.1
ConcreteCMS 5.4.2
ConcreteCMS 5.4.2.1
ConcreteCMS 5.4.2.2
ConcreteCMS 5.6.1
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-18422 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 4,410 35.31%
DE 1,627 13.03%
JP 1,622 12.99%
GB 1,172 9.38%
NL 558 4.47%
CA 485 3.88%
FR 297 2.38%
CH 294 2.35%
AU 263 2.11%
PL 239 1.91%

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CVE-2026-18422 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 9,626 86.92%
Telecommunications 1,125 10.16%
Education 124 1.12%
Business Services 86 0.78%
Government/Politics 28 0.25%
Finance 12 0.11%
Transportation 12 0.11%
Media/Entertainment 11 0.10%
Energy/Resources 10 0.09%
Manufacturing 10 0.09%

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