Search/CVE-2026-14259
● CVE — Medium

CVE-2026-14259

VendormattermostProductmattermost serverDiscoveredSep 14, 2026UpdatedOct 7, 2026

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to enforce board creation permissions when importing archive files which allows an authenticated non-guest team member to create Open or Private boards despite administrator restrictions via importing a crafted .boardarchive file. Mattermost Advisory ID: MMSA-2026-00712

View graph Watch Export
CVSS v3.1
4.3 MEDIUM
EPSS
0.25%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Sep 16, 2026 → Oct 26, 2026
▲ 0.10pp
0.15% → 0.25% over 2 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
ConfidentialityNONE
IntegrityLOW
AvailabilityNONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Connections
2 relationships
Timeline
disclosure → media coverage
Sep 14, 2026
Disclosure — published as a CVE record. · last revised by NVD Oct 7, 2026