Is CVE-2026-8205 actively exploited?

No active exploitation of CVE-2026-8205 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8205 be exploited remotely?

Yes. CVE-2026-8205 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-8205?

CVE-2026-8205 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-8205

CWE-425Published: May 21, 2026· Updated: May 26, 2026

5.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.5th

Official Description

Concrete CMS 9.5.0 and below is vulnerable to authorization bypass in the Calendar Block since action_get_events does not check canView on the calendar which results in restricted event details being disclosed. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks lalalala5678 for reporting.

NVD Source

Technical Analysis

CVE-2026-8205 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.