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CVE-2026-4265

🗓️ 16 Mar 2026 14:20:19Reported by [email protected]Type 
nvd
 nvd
🔗 web.nvd.nist.gov👁 24 Views

CVE-2026-4265: Guest users can post files in channels without upload_file permission by reusing file metadata across teams.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-4265
16 Mar 202612:07
–attackerkb
bdu_fstec
BDU FSTEC
Mattermost Authentication Bypass File Upload
13 May 202600:00
–bdu_fstec
circl
Circl
CVE-2026-4265
17 Mar 202600:00
–circl
cnnvd
CNNVD
Mattermost 安全漏洞
16 Mar 202600:00
–cnnvd
cve
CVE
CVE-2026-4265
16 Mar 202612:07
–cve
cvelist
Cvelist
CVE-2026-4265 Guest user can upload files without permission across teams
16 Mar 202612:07
–cvelist
euvd
EUVD
EUVD-2026-12425
16 Mar 202615:30
–euvd
github
Github Security Blog
Mattermost fails to validate team-specific upload_file permissions
16 Mar 202615:30
–github
mend
Mend
CVE-2026-4265
16 Mar 202612:07
–mend
osv_ghsa
osv_ghsa
GHSA-XPVF-6QCC-9JQC Mattermost fails to validate team-specific upload_file permissions
16 Mar 202615:30
–osv_ghsa
Rows per page
NVD
Node
OR
mattermostmattermost_serverRange10.11.0–10.11.11
mattermostmattermost_serverRange11.2.0–11.2.3
mattermostmattermost_serverRange11.3.0–11.3.1

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