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Mattermost authorization issue vulnerabilities

🗓️ 15 Oct 2026 16:00:00Reported by China National Vulnerability Database of Information SecurityType 
cnnvd
 cnnvd
🔗 www.cnnvd.org.cn👁 4 Views

Authorization issue in Mattermost allows authenticated users to leak private team details.

Related
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-18256
16 Oct 202608:09
–circl
cve
CVE
CVE-2026-18256
16 Oct 202607:13
–cve
cvelist
Cvelist
CVE-2026-18256 Private team metadata disclosure via the team search API
16 Oct 202607:13
–cvelist
euvd
EUVD
EUVD-2026-102749
16 Oct 202607:13
–euvd
mend
Mend
CVE-2026-18256
16 Oct 202607:13
–mend
nvd
NVD
CVE-2026-18256
16 Oct 202608:17
–nvd
ptsecurity
Positive Technologies
PT-2026-115508
16 Oct 202600:00
–ptsecurity
rapid7
Rapid7 Vulnerability Database (full)
CVE-2026-18256: Incorrect Authorization
16 Oct 202600:00
–rapid7
vulnrichment
Vulnrichment
CVE-2026-18256 Private team metadata disclosure via the team search API
16 Oct 202607:13
–vulnrichment

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19 Oct 2026 08:59Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.14.3
EPSS0.00162
SSVC
4