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CVE-2026-12985 Mattermost DCR redirect URI allowlist bypass via improper URL component validation

🗓️ 14 Sep 2026 14:09:53Reported by MattermostType 
cvelist
 cvelist
🔗 www.cve.org👁 6 Views

Mattermost up to 11.9.0 DCR redirect URI allowlist bypass via query string manipulation.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
cve
CVE
CVE-2026-12985
14 Sep 202614:09
cve
euvd
EUVD
EUVD-2026-77520
14 Sep 202614:09
euvd
nvd
NVD
CVE-2026-12985
14 Sep 202615:17
nvd
ptsecurity
Positive Technologies
PT-2026-91221
14 Sep 202600:00
ptsecurity
vulnrichment
Vulnrichment
CVE-2026-12985 Mattermost DCR redirect URI allowlist bypass via improper URL component validation
14 Sep 202614:09
vulnrichment
[
  {
    "defaultStatus": "unaffected",
    "product": "Mattermost",
    "vendor": "Mattermost",
    "versions": [
      {
        "lessThanOrEqual": "11.9.0",
        "status": "affected",
        "version": "11.9.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "11.8.4",
        "status": "affected",
        "version": "11.8.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "11.7.7",
        "status": "affected",
        "version": "11.7.0",
        "versionType": "semver"
      },
      {
        "version": "11.10.0",
        "status": "unaffected"
      },
      {
        "version": "11.9.1",
        "status": "unaffected"
      },
      {
        "version": "11.8.5",
        "status": "unaffected"
      },
      {
        "version": "11.7.8",
        "status": "unaffected"
      }
    ]
  }
]

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