CVE-2026-81897 Details
In Concrete CMS below CMS 9.5.3, the save_control action in the Express entities forms dashboard controller did not validate the anti-CSRF token. By causing an authenticated administrator to submit a forged cross-site request, a remote attacker without credentials could write attacker-controlled headline and body values to an existing Express form Text control. Those values were emitted without output encoding by the Express form Text element, so the injected markup executed as persistent JavaScript for any administrator who later opened the affected entry, resulting in stored cross-site scripting. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.7 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/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-2026-81897
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%).
0.16 Probability of exploitation activity being observed over the next 30 days (6th percentile)
CVSS score for CVE-2026-81897
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.
5.4 Medium
Products affected by CVE-2026-81897
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-2026-81897 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-2026-81897 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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