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CVE-2026-25783 Denial of service via malformed User-Agent header in getBrowserVersion

🗓️ 16 Mar 2026 12:04:18Reported by MattermostType 
cvelist
 cvelist
🔗 www.cve.org👁 43 Views

Authenticated attacker can trigger denial of service via crafted User-Agent header getBrowserVersion.

Related
Affected
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 安全漏洞
16 Mar 202600:00
–cnnvd
cve
CVE
CVE-2026-25783
16 Mar 202612:04
–cve
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
osv_ghsa
osv_ghsa
GHSA-2V3W-6G35-5F9V Mattermost fails to properly validate User-Agent header tokens
16 Mar 202615:30
–osv_ghsa
Rows per page
[
  {
    "defaultStatus": "unaffected",
    "product": "Mattermost",
    "vendor": "Mattermost",
    "versions": [
      {
        "lessThanOrEqual": "11.3.0",
        "status": "affected",
        "version": "11.3.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "11.2.2",
        "status": "affected",
        "version": "11.2.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "10.11.10",
        "status": "affected",
        "version": "10.11.0",
        "versionType": "semver"
      },
      {
        "version": "11.4.0",
        "status": "unaffected"
      },
      {
        "version": "11.3.1",
        "status": "unaffected"
      },
      {
        "version": "11.2.3",
        "status": "unaffected"
      },
      {
        "version": "10.11.11",
        "status": "unaffected"
      }
    ]
  }
]

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