CVE-2026-8205
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 11% of all known CVEs.
References
Related Vulnerabilities
Other CWE-425 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-45195 | High | 7.5 | 100% | KEV | Fix |
| CVE-2021-26085 | Medium | 5.3 | 100% | KEV + Ransom | Fix |
| CVE-2024-0204 | Critical | 9.8 | 95% | - | Fix |
| CVE-2018-19207 | Critical | 9.8 | 88% | - | Fix |
| CVE-2017-17736 | Critical | 9.8 | 69% | - | Fix |
| CVE-2021-40875 | High | 7.5 | 48% | - | Fix |
Common questions
How do I fix CVE-2026-8205?
No published fix for CVE-2026-8205 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-8205 being actively exploited?
Not that we know of. CVE-2026-8205 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.21% is the estimated probability that it will be exploited in the next 30 days. That is higher than 11% of all scored CVEs.
How severe is CVE-2026-8205?
CVE-2026-8205 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-23.