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GHSA-86vc-mg26-fj6x
GHSA-86vc-mg26-fj6x

Author: advisory-database[bot]

advisories/github-reviewed/2026/03/GHSA-86vc-mg26-fj6x/GHSA-86vc-mg26-fj6x.json

@@ -0,0 +1,137 @@
+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-86vc-mg26-fj6x",
+  "modified": "2026-03-30T22:21:55Z",
+  "published": "2026-03-25T18:31:48Z",
+  "aliases": [
+    "CVE-2026-20719"
+  ],
+  "summary": "Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embeds ",
+  "details": "Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to prevent rendering of external SVGs on link embeds which allows unauthenticated users to crash the Mattermost webapp and desktop app via creating an issue or PR on GitHub. Mattermost Advisory ID: MMSA-2026-00595",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/mattermost/mattermost/server/v8"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "11.4.0-rc1"
+            },
+            {
+              "fixed": "11.4.1"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/mattermost/mattermost/server/v8"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "11.3.0-rc1"
+            },
+            {
+              "fixed": "11.3.2"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/mattermost/mattermost/server/v8"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "11.2.0-rc1"
+            },
+            {
+              "fixed": "11.2.4"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/mattermost/mattermost/server/v8"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "8.0.0-20260105080200-d27a2195068d"
+            },
+            {
+              "fixed": "8.0.0-20260217110922-b7d4a1f1f59b"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/mattermost/mattermost/server/v8"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "10.11.0-rc1"
+            },
+            {
+              "fixed": "10.11.2"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "ADVISORY",
+      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20719"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/mattermost/mattermost"
+    },
+    {
+      "type": "WEB",
+      "url": "https://mattermost.com/security-updates"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-754"
+    ],
+    "severity": "MODERATE",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-03-30T22:21:55Z",
+    "nvd_published_at": "2026-03-25T17:16:30Z"
+  }
+}