{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-121971 in the wild and no public exploit code.","exposure":"","fix":"Upgrade to a fixed version.","what":"CVE-2026-121971 is a high-severity vulnerability in sensiolabs symfony, published on 4 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-121971 and fix it if it is affected.\n\nWhat it is: CVE-2026-121971 is a high-severity vulnerability in sensiolabs symfony, published on 4 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-121971 in the wild and no public exploit code.\n\nAffected product: sensiolabs symfony. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-121971/ (Markdown: https://insights.sbomify.com/CVE-2026-121971/index.md)","id":"CVE-2026-121971","markdown":"https://insights.sbomify.com/CVE-2026-121971/index.md","name":"CVE-2026-121971","record":{"aliases":["DEBIAN-CVE-2026-121971","GHSA-gq53-v8w2-gjhj","GHSA-wgw5-9p87-vhvp","UBUNTU-CVE-2026-121971"],"analysis":null,"analysis_generated_by":null,"assigner":"Checkmarx","cpe":[],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-522","name":"Insufficiently Protected Credentials"},{"id":"CWE-200","name":"Exposure of Sensitive Information to an Unauthorized Actor"}],"description":"The component ScopingHttpClient in Symfony HttpClient merges 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\" to be sent to another origin together with the default scope’s credentials, and resulting in potential disclosure of those credentials to an attacker-controlled server. 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.\n\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.\n\nThis is reachable whenever an attacker controls the beginning of a URL passed to a client built with a base_uri and credentials, including those created with HttpClient::createForBaseUri() or configured under framework.http_client.scoped_clients.\n\nTo solve the issue, after resolving 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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Symfony: ScopingHttpClient Sends the Credentials of Its Default Scope to Other Origins Through Network-Path References","id":"CVE-2026-121971","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Modula Image Gallery \u003c= 3.0.17 - Authenticated (Author+) Stored Cross-Site Scripting via 'items' Parameter","id":"CVE-2026-121976"},"nickname":null,"packages":[],"prev":{"headline":"Pay with Vipps and MobilePay for WooCommerce before 6.4.1 Webhook Signature Forgery","id":"CVE-2026-121970"},"products":["symfony"],"published":"2026-11-04","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-11-05","vendors":["sensiolabs"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-121971/"}