CVE-2026-81915 Details
Concrete CMS below 9.5.3 does not perform an object-level authorization check when a Page Type was updated. The Types::submit() dashboard controller loaded and saved the Page Type identified by a user-supplied ptID without calling canEditPageType(), so a signed-in dashboard user permitted to edit one Page Type could modify the configuration of Page Types outside their assigned authorization boundary. The update_page_type token was validated but is action- and user-scoped rather than object-scoped, so it did not constrain which Page Type could be targeted. 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 Andrew Gonzalez for reporting.
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Exploit prediction scoring system (EPSS) score for CVE-2026-81915
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%).
0.29 Probability of exploitation activity being observed over the next 30 days (20th percentile)
CVSS score for CVE-2026-81915
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.
5.3 Medium
Products affected by CVE-2026-81915
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-2026-81915 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 2,308 34.32%
DE 1,016 15.11%
JP 692 10.29%
GB 666 9.90%
NL 342 5.09%
CA 297 4.42%
FR 170 2.53%
AU 159 2.36%
CH 152 2.26%
PL 122 1.81%

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CVE-2026-81915 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 5,244 89.44%
Telecommunications 412 7.03%
Education 83 1.42%
Business Services 50 0.85%
Government/Politics 17 0.29%
Media/Entertainment 9 0.15%
Transportation 9 0.15%
Finance 8 0.14%
Manufacturing 7 0.12%
Energy/Resources 6 0.10%

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