83 行
4.6 KiB
JSON
83 行
4.6 KiB
JSON
{
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"canonical_id": "caddy--CVE-2026-27589",
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"system_id": "caddy",
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"display_name": "Caddy",
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"category": "servers",
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"advisory_mode": "server",
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"title": "Caddy is vulnerable to cross-origin config application via local admin API /load ",
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"summary": "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\u2019s 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)",
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"published_at": "2026-02-24T20:37:35Z",
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"updated_at": "2026-02-27T19:54:36Z",
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"severity": "medium",
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"cvss_score": 4.0,
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"exploit_status": "unknown",
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"source_confidence": "official",
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"official_source_url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2",
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"secondary_source_urls": [
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"https://nvd.nist.gov/vuln/detail/CVE-2026-27589",
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"https://github.com/caddyserver/caddy/commit/65e0ddc22137bbbaa68c842ae0b98d0548504545",
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"https://github.com/caddyserver/caddy",
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"https://github.com/caddyserver/caddy/releases/tag/v2.11.1",
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"https://github.com/user-attachments/files/25079818/poc.zip",
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"https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md",
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"https://pkg.go.dev/vuln/GO-2026-4537"
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],
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"aliases": [
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"CVE-2026-27589",
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"GO-2026-4537",
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"GHSA-879p-475x-rqh2"
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],
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"cve_ids": [
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"CVE-2026-27589"
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],
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"ghsa_ids": [
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"GHSA-879p-475x-rqh2"
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],
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"osv_ids": [
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"GHSA-879p-475x-rqh2",
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"GO-2026-4537"
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],
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"affected_versions": [
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"introduced=0, fixed<2.11.1"
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],
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"fixed_versions": [
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"2.11.1"
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],
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"package_name": "github.com/caddyserver/caddy/v2",
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"render_markdown": false,
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"case_path": null,
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"secure_code_topics": [
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"proxy-trust-boundary",
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"request-smuggling-boundary",
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"token-cookie-storage",
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"plugin-extension-trust-policy",
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"dependency-upgrade-policy"
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],
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"status": "generated",
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"triage_reasons": [],
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"verification_status": "triage-manual",
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"verification_mode": "synthetic",
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"last_verified_at": null,
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"last_run_id": null,
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"evidence_bundle": null,
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"historical_status": null,
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"latest_status": null,
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"browser_evidence": {
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"required": false,
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"present": false,
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"refs": []
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},
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"repro_profile_id": "file-upload-generic",
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"artifact_mode": "synthetic",
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"blocked_reason": null,
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"metadata": {
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"source_names": [
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"OSV Caddy"
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],
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"source_kinds": [
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"osv-batch"
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],
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"candidate_count": 2
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}
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}
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