Publish Advisories

GHSA-gg42-mwr6-p82c
GHSA-gg42-mwr6-p82c

Author: advisory-database[bot]

advisories/github-reviewed/2022/05/GHSA-gg42-mwr6-p82c/GHSA-gg42-mwr6-p82c.json

@@ -0,0 +1,100 @@
+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-gg42-mwr6-p82c",
+  "modified": "2026-01-12T18:34:33Z",
+  "published": "2022-05-24T17:21:05Z",
+  "aliases": [
+    "CVE-2017-18894"
+  ],
+  "summary": "Mattermost Server has intermittent Authorization bypass for resource-owners",
+  "details": "An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5, when used as an OAuth 2.0 service provider. Resource-owner authorization can be intermittently bypassed, allowing account takeover.",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/mattermost/mattermost-server"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "4.0.5"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/mattermost/mattermost-server"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "4.1.0"
+            },
+            {
+              "fixed": "4.1.1"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/mattermost/mattermost-server"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "4.2.0-rc1"
+            },
+            {
+              "fixed": "4.2.0"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "ADVISORY",
+      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-18894"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/mattermost/mattermost"
+    },
+    {
+      "type": "WEB",
+      "url": "https://mattermost.com/security-updates"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-639",
+      "CWE-732"
+    ],
+    "severity": "HIGH",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-01-12T18:34:33Z",
+    "nvd_published_at": "2020-06-19T19:15:00Z"
+  }
+}