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CVE-2026-6339

🗓️ 05 Jun 2026 19:32:56Reported by redhat.comType 
redhatcve
 redhatcve
🔗 access.redhat.com👁 30 Views

Mattermost fails X-Requested-With header validation on burn-on-read reveal, letting members reveal messages.

Related
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-6339
18 May 202608:05
–attackerkb
circl
Circl
CVE-2026-6339
18 May 202614:54
–circl
cnnvd
CNNVD
Mattermost 访问控制错误漏洞
18 May 202600:00
–cnnvd
cve
CVE
CVE-2026-6339
18 May 202608:05
–cve
cvelist
Cvelist
CVE-2026-6339 Missing request origin validation on burn-on-read reveal endpoint
18 May 202608:05
–cvelist
euvd
EUVD
EUVD-2026-30749
18 May 202608:05
–euvd
github
Github Security Blog
Mattermost doesn't validate the X-Requested-With header on the burn-on-read reveal endpoint
18 May 202609:31
–github
nessus
Tenable Nessus
Mattermost Server 11.4.x <= 11.4.3 / 11.5.x <= 11.5.1 Origin Validation Error (MMSA-2026-00636)
22 May 202600:00
–nessus
mend
Mend
CVE-2026-6339
18 May 202608:05
–mend
nvd
NVD
CVE-2026-6339
18 May 202609:16
–nvd
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05 Jun 2026 19:32Current
7.9High risk
Vulners AI Score7.9
CVSS 3.14.3
EPSS0.00157
SSVC
30