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CVE-2026-25783: Improper Validation of Specified Type of Input

🗓️ 16 Mar 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com👁 7 Views

Authenticated request panic in Mattermost 11.3.0, 11.2.2, 10.11.10 via User-Agent header.

Related
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-25783
16 Mar 202612:04
–attackerkb
bdu_fstec
BDU FSTEC
Mattermost DoS
13 May 202600:00
–bdu_fstec
circl
Circl
CVE-2026-25783
16 Feb 202600:00
–circl
cnnvd
CNNVD
Mattermost security vulnerabilities
16 Mar 202600:00
–cnnvd
cve
CVE
CVE-2026-25783
16 Mar 202612:04
–cve
cvelist
Cvelist
CVE-2026-25783 Denial of service via malformed User-Agent header in getBrowserVersion
16 Mar 202612:04
–cvelist
euvd
EUVD
EUVD-2026-12416
16 Mar 202615:30
–euvd
github
Github Security Blog
Mattermost fails to properly validate User-Agent header tokens
16 Mar 202615:30
–github
mend
Mend
CVE-2026-25783
16 Mar 202612:04
–mend
nvd
NVD
CVE-2026-25783
16 Mar 202614:18
–nvd
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18 Mar 2026 00:00Current
6.2Medium risk
Vulners AI Score6.2
CVSS 3.14.3
EPSS0.00303
SSVC
7