Home→Vulnerabilities→CVE-2026-8350
Disclosed

CVE-2026-8350

Concrete CMS 9.5.0 and below is vulnerable to missing authorization in the bulk_user_assignment.php which can lead to privilege escalation to Administrative Group. Any authenticated user with access to the bulk user assignment dashboard page can add any user email to any group and can remove legitimate admins. The Concrete CMS security team gave this vulnerability a

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Exploitation Probability (EPSS)

Low Priority
0.04%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

1 events
May 21, 2026
Vulnerability Disclosed
Published to component-level vulnerability database.

Threat Actor Attribution

PREMIUM INTEL
Associated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notesConcretecms

Am I Vulnerable?

Check your domain or package.json for CVE-2026-8350 exposure.

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Vulnerability Details

CVSS Base Score
N/A/ 10
Published Date
May 21, 2026
Last Modified
May 21, 2026
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