CVE-2026-8417 Details
Concrete CMS 9.5.0 and below does not validate a CSRF token before processing requests to /dashboard/extend/update/do_update/. The do_update() method in concrete/controllers/single_page/dashboard/extend/update.php checks only canInstallPackages() before executing upgradeCoreData() and upgrade() on the named package's controller. Because the endpoint is a state-changing GET route with no token enforcement, an attacker can force an authenticated administrator to trigger a package upgrade via a single cross-site navigation.In order to be vulnerable, the victim must be passing canInstallPackages() and and a target package must already be already installed. 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:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks  https://github.com/maru1009  for reporting.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-8417
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%).
0.12 Probability of exploitation activity being observed over the next 30 days (2nd percentile)
CVSS score for CVE-2026-8417
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-2026-8417
ConcreteCMS 5.7.5.7
ConcreteCMS 5.7.5.8
ConcreteCMS 5.7.5.9
ConcreteCMS 8.0.1
ConcreteCMS 8.0.2
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-2026-8417 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 5,545 38.43%
DE 1,893 13.12%
JP 1,399 9.70%
GB 1,211 8.39%
NL 689 4.77%
CA 607 4.21%
FR 398 2.76%
PL 394 2.73%
AU 330 2.29%
CH 322 2.23%

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CVE-2026-8417 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 11,280 88.51%
Telecommunications 1,090 8.55%
Education 128 1.00%
Business Services 83 0.65%
Media/Entertainment 56 0.44%
Government/Politics 18 0.14%
Energy/Resources 14 0.11%
Manufacturing 14 0.11%
Healthcare/Wellness 13 0.10%
Transportation 9 0.07%

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