CVE-2026-81912 Details
Concrete CMS before 9.5.3 is vulnerable to Cross-Site Request Forgery in the Move Multiple Groups feature. The dashboard/users/groups/bulkupdate/confirm() endpoint moved the selected group tree nodes without validating an action token, so a state-changing group move could be processed for an authenticated user who did not initiate it. Because relocating a group under a new parent causes that group's members to inherit the parent's permissions, a forged move can change effective authorization. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.7 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-81912
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%).
0.19 Probability of exploitation activity being observed over the next 30 days (8th percentile)
CVSS score for CVE-2026-81912
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.
5.7 Medium
Products affected by CVE-2026-81912
ConcreteCMS 8.4.4
ConcreteCMS 8.4.5
ConcreteCMS 8.5.0
ConcreteCMS 8.5.1
ConcreteCMS 8.5.10
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-2026-81912 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 4,427 35.37%
DE 1,629 13.01%
JP 1,623 12.97%
GB 1,173 9.37%
NL 559 4.47%
CA 485 3.87%
FR 297 2.37%
CH 294 2.35%
AU 263 2.10%
PL 239 1.91%

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CVE-2026-81912 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 9,655 86.93%
Telecommunications 1,125 10.13%
Education 124 1.12%
Business Services 86 0.77%
Government/Politics 28 0.25%
Manufacturing 12 0.11%
Transportation 12 0.11%
Finance 12 0.11%
Media/Entertainment 11 0.10%
Energy/Resources 10 0.09%

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