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CVE-2026-3636: Exposure of Sensitive Information to an Unauthorized Actor

🗓️ 22 May 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com👁 5 Views

Unauthorized users can access team member roles in Mattermost via team API endpoints.

Related
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-3636
22 May 202610:23
–attackerkb
bdu_fstec
BDU FSTEC
Mattermost Information Disclosure
1 Jul 202600:00
–bdu_fstec
circl
Circl
CVE-2026-3636
22 May 202612:53
–circl
cnnvd
CNNVD
Mattermost security vulnerabilities
22 May 202600:00
–cnnvd
cve
CVE
CVE-2026-3636
22 May 202610:23
–cve
cvelist
Cvelist
CVE-2026-3636 Sanitize team member data returned by API
22 May 202610:23
–cvelist
euvd
EUVD
EUVD-2026-31428
22 May 202610:23
–euvd
github
Github Security Blog
Mattermost doesn't sanitize team member data when returned via API to users without elevated permissions
26 May 202613:30
–github
mend
Mend
CVE-2026-3636
22 May 202610:23
–mend
nvd
NVD
CVE-2026-3636
22 May 202611:16
–nvd
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23 Jul 2026 00:00Current
6.3Medium risk
Vulners AI Score6.3
CVSS 3.14.3
EPSS0.00301
SSVC
5