CVE-2026-8350 Details
Concrete CMS 9.5.0 and below is vulnerable to missing authorization in the bulk_user_assignment.php which can lead to privilege escalation to Administrative Group. Any authenticated user with access to the bulk user assignment dashboard page can add any user email to any group and can remove legitimate admins. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 7.5 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Vincent55 for reporting.
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Exploit prediction scoring system (EPSS) score for CVE-2026-8350
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%).
0.3 Probability of exploitation activity being observed over the next 30 days (22nd percentile)
CVSS score for CVE-2026-8350
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.
8.8 High
Products affected by CVE-2026-8350
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-2026-8350 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 5,527 38.00%
DE 1,898 13.05%
JP 1,399 9.62%
GB 1,304 8.97%
NL 660 4.54%
CA 603 4.15%
PL 421 2.89%
FR 392 2.70%
AU 339 2.33%
CH 332 2.28%

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CVE-2026-8350 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 11,463 88.74%
Telecommunications 1,070 8.28%
Education 126 0.98%
Business Services 90 0.70%
Media/Entertainment 60 0.46%
Government/Politics 23 0.18%
Healthcare/Wellness 14 0.11%
Energy/Resources 12 0.09%
Transportation 12 0.09%
Manufacturing 11 0.09%

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