CVE-2026-121971

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The same happens with a different port or user-info part on the same host.\n\n\n\n\n\n\n\n\n\nThis is reachable whenever an attacker controls the beginning of a URL passed to a client built with a base_uri\u00a0and credentials, including those created with HttpClient::createForBaseUri()\u00a0or configured under framework.http_client.scoped_clients.\n\nTo solve the issue, after\u00a0resolving a relative URL against the base URI of the default scope, ScopingHttpClient now compares the scheme and authority of the result with those of the base URI, parsed the way the request is sent.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The component <code>ScopingHttpClient</code>&nbsp;in Symfony HttpClient&nbsp;merges the options of its default scope (such as <code>auth_bearer</code> or <code>auth_basic</code>) into a request before resolving a relative URL against the <code>base_uri</code>, allowing a network-path reference such as \"<code>//evil.example/steal\"</code>&nbsp;to be sent to another origin together with the default scope\u2019s credentials, and resulting in potential disclosure of those credentials to an attacker-controlled server.&nbsp;<span>This affects Symfony in versions 5.x prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11.</span></p><p>The resolved URL falls outside the origin of the base URI, yet it keeps the merged options, whereas the absolute spelling \"<code>https://evil.example/steal\"</code> receives none. 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The same happens with a different port or user-info part on the same host.\n\n\n\n\n\n\n\n\n\nThis is reachable whenever an attacker controls the beginning of a URL passed to a client built with a base_uri\u00a0and credentials, including those created with HttpClient::createForBaseUri()\u00a0or configured under framework.http_client.scoped_clients.\n\nTo solve the issue, after\u00a0resolving a relative URL against the base URI of the default scope, ScopingHttpClient now compares the scheme and authority of the result with those of the base URI, parsed the way the request is sent.", "supportingMedia": [{"type": "text/html", "value": "<p>The component <code>ScopingHttpClient</code>&nbsp;in Symfony HttpClient&nbsp;merges the options of its default scope (such as <code>auth_bearer</code> or <code>auth_basic</code>) into a request before resolving a relative URL against the <code>base_uri</code>, allowing a network-path reference such as \"<code>//evil.example/steal\"</code>&nbsp;to be sent to another origin together with the default scope\u2019s credentials, and resulting in potential disclosure of those credentials to an attacker-controlled server.&nbsp;<span>This affects Symfony in versions 5.x prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11.</span></p><p>The resolved URL falls outside the origin of the base URI, yet it keeps the merged options, whereas the absolute spelling \"<code>https://evil.example/steal\"</code> receives none. The same happens with a different port or user-info part on the same host.</p><p>\n\n</p><p>This is reachable whenever an attacker controls the beginning of a URL passed to a client built with a b<code>ase_uri</code>&nbsp;and credentials, including those created with <code>HttpClient::createForBaseUri()</code>&nbsp;or configured under <code>framework.http_client.scoped_clients</code>.<br><br>To solve the issue, after<span>&nbsp;resolving a relative URL against the base URI of the default scope, </span><code>ScopingHttpClient</code><span> now compares the scheme and authority of the result with those of the base URI, parsed the way the request is sent.&nbsp;</span></p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-200", "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-522", "description": "CWE-522 Insufficiently Protected Credentials"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.56", "versionStartIncluding": "0"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.4.50", "versionStartIncluding": "6.0.0"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.4.23", "versionStartIncluding": "7.0.0"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "8.1.11", "versionStartIncluding": "8.0.0"}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "shortName": "Checkmarx", "dateUpdated": "2026-11-04T17:43:34.806Z"}}}, "cveMetadata": {"cveId": "CVE-2026-121971", "state": "PUBLISHED", "dateUpdated": "2026-11-05T19:07:02.219Z", "dateReserved": "2026-11-04T13:03:55.851Z", "assignerOrgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "datePublished": "2026-11-04T17:43:34.806Z", "assignerShortName": "Checkmarx"}, "dataVersion": "5.2"}

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{"bugzilla": {"description": "symfony/http-client: symfony/http-client: Information disclosure via relative URL handling", "id": "2567520", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567520"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-201", "details": ["The component ScopingHttpClient\u00a0in Symfony HttpClient\u00a0merges the options of its default scope (such as auth_bearer or auth_basic) into a request before resolving a relative URL against the base_uri, allowing a network-path reference such as \"//evil.example/steal\"\u00a0to be sent to another origin together with the default scope\u2019s credentials, and resulting in potential disclosure of those credentials to an attacker-controlled server.\u00a0This affects Symfony in versions 5.x prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11.\nThe resolved URL falls outside the origin of the base URI, yet it keeps the merged options, whereas the absolute spelling \"https://evil.example/steal\" receives none. The same happens with a different port or user-info part on the same host.\nThis is reachable whenever an attacker controls the beginning of a URL passed to a client built with a base_uri\u00a0and credentials, including those created with HttpClient::createForBaseUri()\u00a0or configured under framework.http_client.scoped_clients.\nTo solve the issue, after\u00a0resolving a relative URL against the base URI of the default scope, ScopingHttpClient now compares the scheme and authority of the result with those of the base URI, parsed the way the request is sent.", "A flaw was found in Symfony HttpClient. The scoped HTTP client attaches default authentication credentials to requests before verifying that the resolved destination matches the intended trusted domain. A remote attacker who can control or influence the target URL can supply a specially crafted relative address that redirects the request to an external server. This flaw leads to information disclosure, potentially exposing sensitive authentication tokens and passwords to an attacker-controlled system."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-121971", "public_date": "2026-11-04T17:43:34Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121971\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121971\nhttps://github.com/symfony/symfony/commit/64c34e85bd03b3f8a735d8e1af393659dda91d7c\nhttps://github.com/symfony/symfony/security/advisories/GHSA-gq53-v8w2-gjhj"], "statement": "This vulnerability is rated as Important severity because an unauthenticated remote attacker can trigger the transmission of high-value authentication credentials to arbitrary hosts without requiring special privileges. In typical Red Hat environments, Symfony HttpClient is utilized within custom PHP applications and services; the risk is realized only when applications construct outbound requests using user-controlled relative paths against pre-configured authentication scopes. Applications that strictly validate or restrict outbound request targets, or those that do not utilize scoped credential configurations, are not exposed to this risk.", "threat_severity": "Important"}

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