Publish GHSA-879p-475x-rqh2

Author: advisory-database[bot]

advisories/github-reviewed/2026/02/GHSA-879p-475x-rqh2/GHSA-879p-475x-rqh2.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-879p-475x-rqh2",
+  "modified": "2026-02-24T20:37:35Z",
+  "published": "2026-02-24T20:37:35Z",
+  "aliases": [
+    "CVE-2026-27589"
+  ],
+  "summary": "Caddy is vulnerable to cross-origin config application via local admin API /load ",
+  "details": "commit: e0f8d9b2047af417d8faf354b675941f3dac9891 (as-of 2026-02-04)\nchannel: GitHub security advisory (per SECURITY.md)\n\n## summary\n\nThe local caddy admin API (default listen `127.0.0.1:2019`) exposes a state-changing `POST /load` endpoint that replaces the entire running configuration.\n\nWhen origin enforcement is not enabled (`enforce_origin` not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. this can change the admin listener settings and alter HTTP server behavior without user intent.\n\n## Severity\n\nMedium\n\nJustification:\n- The attacker can apply an arbitrary caddy config (integrity impact) by driving a victim’s local admin API.\n- Exploitation requires a victim running caddy with the admin API enabled and visiting an attacker-controlled page (or otherwise issuing the request from an untrusted local client).\n\n## Affected component\n\n- `caddyconfig/load.go: adminLoad.handleLoad` (`/load` admin endpoint)\n- Pinned callsite: https://github.com/caddyserver/caddy/blob/e0f8d9b2047af417d8faf354b675941f3dac9891/caddyconfig/load.go#L73\n\n## Reproduction\n\nAttachment: `poc.zip` (integration harness) with canonical and control runs.\n\n```bash\nunzip -q -o poc.zip -d poc\ncd poc/poc-F-CADDY-ADMIN-LOAD-001\nmake test\n```\n\nExpected output (excerpt):\n\n```\n[CALLSITE_HIT]: adminLoad.handleLoad\n[PROOF_MARKER]: http_code=200 admin_moved=true response_pwned=true\n```\n\nControl output (excerpt):\n\n```\n[NC_MARKER]: http_code=403 load_blocked=true admin_moved=false response_pwned=false\n```\n\n## Impact\n\nAn attacker can replace the running caddy configuration via the local admin API. Depending on the deployed configuration/modules, this can:\n- Change admin listener settings (e.g., move the admin listener to a new address)\n- Change HTTP server behavior (e.g., alter routes/responses)\n\n## Suggested remediation\n\nEnsure cross-origin web content cannot trigger `POST /load` on the local admin API by default, for example by:\n- Enabling origin enforcement by default for unsafe methods, and/or\n- Requiring an unguessable token for `/load` (and other state-changing admin endpoints).\n\n[poc.zip](https://github.com/user-attachments/files/25079818/poc.zip)\n[PR_DESCRIPTION.md](https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md)",
+  "severity": [
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/caddyserver/caddy/v2"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "2.11.1"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2"
+    },
+    {
+      "type": "ADVISORY",
+      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27589"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/caddyserver/caddy/commit/65e0ddc22137bbbaa68c842ae0b98d0548504545"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/caddyserver/caddy"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/caddyserver/caddy/releases/tag/v2.11.1"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-352"
+    ],
+    "severity": "MODERATE",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-02-24T20:37:35Z",
+    "nvd_published_at": "2026-02-24T17:29:04Z"
+  }
+}