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{
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"canonical_id": "symfony--CVE-2021-41267",
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"system_id": "symfony",
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"display_name": "Symfony",
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"category": "frameworks",
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"advisory_mode": "core",
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"title": "Webcache Poisoning in symfony/http-kernel",
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"summary": "Description\n-----------\n\nWhen a Symfony application is running behind a proxy or a load-balancer, you can tell Symfony to look for the `X-Forwarded-*` HTTP headers. HTTP headers that are not part of the \"trusted_headers\" allowed list are ignored and protect you from \"Cache poisoning\" attacks. \n\nIn Symfony 5.2, we've added support for the `X-Forwarded-Prefix` header, but this header was accessible in sub-requests, even if it was not part of the \"trusted_headers\" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` HTTP header, leading to a web cache poisoning issue.\n\nResolution\n----------\n\nSymfony now ensures that the `X-Forwarded-Prefix` HTTP header is not forwarded to sub-requests when it is not trusted.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487) for branch 5.3.\n\nCredits\n-------\n\nWe would like to thank Soner Sayakci for reporting the issue and J\u00e9r\u00e9my Deruss\u00e9 for fixing the issue.\n",
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"published_at": "2021-11-24T20:04:25Z",
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"updated_at": "2026-03-13T22:00:11.423907Z",
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"severity": "low",
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"cvss_score": 3.1,
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"exploit_status": "unknown",
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"source_confidence": "official",
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"official_source_url": "https://github.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2q",
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"secondary_source_urls": [
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"https://nvd.nist.gov/vuln/detail/CVE-2021-41267",
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"https://github.com/symfony/symfony/pull/44243",
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"https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487",
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"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE-2021-41267.yaml",
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"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-41267.yaml",
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"https://github.com/symfony/symfony/releases/tag/v5.3.12",
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"https://symfony.com/cve-2021-41267"
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],
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"aliases": [
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"BIT-symfony-2021-41267",
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"CVE-2021-41267",
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"GHSA-q3j3-w37x-hq2q"
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],
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"cve_ids": [
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"CVE-2021-41267"
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],
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"ghsa_ids": [
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"GHSA-q3j3-w37x-hq2q"
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],
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"osv_ids": [
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"GHSA-q3j3-w37x-hq2q"
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],
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"affected_versions": [
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"v5.2.0",
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"v5.2.1",
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"v5.2.10",
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"v5.2.11",
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"v5.2.12",
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"v5.2.13",
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"v5.2.14",
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"v5.2.2",
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"v5.2.3",
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"v5.2.4",
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"v5.2.5",
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"v5.2.6",
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"v5.2.7",
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"v5.2.8",
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"v5.2.9",
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"v5.3.0",
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"v5.3.0-BETA1",
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"v5.3.0-BETA2",
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"v5.3.0-BETA3",
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"v5.3.0-BETA4",
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"introduced=5.2.0, fixed<5.3.12"
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],
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"fixed_versions": [
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"5.3.12"
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],
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"package_name": "symfony/symfony",
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"render_markdown": true,
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"case_path": "07-framework-security/frameworks/symfony/cases/symfony-cve-2021-41267.md",
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"secure_code_topics": [
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"xss-output-encoding",
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"authz-server-side-recheck",
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"path-traversal-guard",
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"proxy-trust-boundary"
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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": "xss-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 Symfony"
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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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