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CVE-2026-8821: Missing Authorization

🗓️ 14 Sep 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com👁 10 Views

Authenticated Mattermost members can add users to restricted channels via playbook runs.

Related
Refs
ReporterTitlePublishedViews
Family
cve
CVE
CVE-2026-8821
14 Sep 202610:42
–cve
cvelist
Cvelist
CVE-2026-8821 Playbooks run owner channel membership permission bypass
14 Sep 202610:42
–cvelist
euvd
EUVD
EUVD-2026-77371
14 Sep 202610:42
–euvd
mend
Mend
CVE-2026-8821
14 Sep 202610:42
–mend
nvd
NVD
CVE-2026-8821
14 Sep 202611:17
–nvd
osv_mini
osv_mini
MINI-5VRF-RPRG-9HMG
8 Oct 202620:47
–osv_mini
osv_mini
osv_mini
MINI-F9Q4-3973-XFFG
8 Oct 202620:47
–osv_mini
ptsecurity
Positive Technologies
PT-2026-91154
14 Sep 202600:00
–ptsecurity
vulnrichment
Vulnrichment
CVE-2026-8821 Playbooks run owner channel membership permission bypass
14 Sep 202610:42
–vulnrichment

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07 Oct 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.17.1
EPSS0.0029
SSVC
10