CVE-2026-81916 Details
Concrete CMS before 9.5.3 evaluated the authorization check for an Express entry submission against the entity of the posted form rather than the entity identified by the dashboard route. As a result, a user permitted to add entries to one Express object could create entries in a different Express object outside their authorization scope, potentially polluting protected datasets, triggering workflows, or injecting content into administrative processes. The dashboard submit route resolved the mutated entity from the attacker-controlled route ID while the permission check validated the independently posted form's entity, and the submission proceeded because the two entities were never compared. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.1 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.
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Exploit prediction scoring system (EPSS) score for CVE-2026-81916
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%).
0.27 Probability of exploitation activity being observed over the next 30 days (19th percentile)
CVSS score for CVE-2026-81916
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.
4.3 Medium
Products affected by CVE-2026-81916
ConcreteCMS 9.5.2
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-2026-81916 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 4,622 35.89%
DE 1,692 13.14%
JP 1,637 12.71%
GB 1,184 9.19%
NL 566 4.39%
CA 493 3.83%
FR 300 2.33%
CH 296 2.30%
AU 268 2.08%
PL 257 2.00%

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CVE-2026-81916 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 9,980 87.13%
Telecommunications 1,137 9.93%
Education 124 1.08%
Business Services 92 0.80%
Government/Politics 28 0.24%
Manufacturing 13 0.11%
Finance 13 0.11%
Transportation 12 0.10%
Media/Entertainment 11 0.10%
Energy/Resources 10 0.09%

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