{"answers":{"affected":"12 open source packages ship an affected version, including symfony/html-sanitizer and symfony/symfony. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-45066 in the wild and no public exploit code.","fix":"Upgrade symfony/html-sanitizer to a fixed version for your release line: 6.4.40, 7.4.12 or 8.0.12.","what":"CVE-2026-45066 is a low-severity vulnerability in Sensiolabs Symfony, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-45066 and fix it if it is affected.\n\nWhat it is: CVE-2026-45066 is a low-severity vulnerability in Sensiolabs Symfony, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-45066 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- symfony/html-sanitizer (Packagist): affected from 6.1.0; fixed in 6.4.40\n- symfony/html-sanitizer (Packagist): affected from 6.1.0; fixed in 6.4.40\n- symfony/html-sanitizer (Packagist): affected from 7.0.0; fixed in 7.4.12\n- symfony/html-sanitizer (Packagist): affected from 7.0.0; fixed in 7.4.12\n- symfony/html-sanitizer (Packagist): affected from 8.0.0; fixed in 8.0.12\n- symfony/html-sanitizer (Packagist): affected from 8.0.0; fixed in 8.0.12\n- symfony/symfony (Packagist): affected from 6.1.0; fixed in 6.4.40\n- symfony/symfony (Packagist): affected from 6.1.0; fixed in 6.4.40\n- symfony/symfony (Packagist): affected from 7.0.0; fixed in 7.4.12\n- symfony/symfony (Packagist): affected from 7.0.0; fixed in 7.4.12\n- symfony/symfony (Packagist): affected from 8.0.0; fixed in 8.0.12\n- symfony/symfony (Packagist): affected from 8.0.0; fixed in 8.0.12\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-2026-45066/ (Markdown: https://insights.sbomify.com/CVE-2026-45066/index.md)","id":"CVE-2026-45066","markdown":"https://insights.sbomify.com/CVE-2026-45066/index.md","name":"CVE-2026-45066","record":{"aliases":["DEBIAN-CVE-2026-45066","GHSA-qc95-4862-92fh","UBUNTU-CVE-2026-45066"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"PHP HTML sanitizer","requires_auth":"none","summary":"Attackers can bypass Symfony HtmlSanitizer host allowlists via URL parsing differences and area tag misclassification, allowing off-allowlist links.","user_interaction":"required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"symfony","vendor":"sensiolabs"}],"cvss":{"score":2.3,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-436","name":"Interpretation Conflict"},{"id":"CWE-184","name":"Incomplete List of Disallowed Inputs"}],"description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts() or allowMediaHosts() because UrlSanitizer::parse() follows RFC 3986 while browsers follow WHATWG URL parsing, and because \u003carea href\u003e is checked against the media policy rather than the link policy. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.","ecosystems":["Packagist"],"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 has an HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and \u003carea\u003e Misclassification","id":"CVE-2026-45066","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"sensiolabs:symfony","products":["sensiolabs:symfony"],"type":"security_feature_bypass","year":"2026"},"n_packages":12,"n_references":5,"next":{"headline":"Symfony: Email Header / SMTP Command Injection via CRLF in Symfony\\Component\\Mime\\Address","id":"CVE-2026-45067"},"packages":[{"ecosystem":"Packagist","fixed":["6.4.40"],"introduced":["6.1.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":null,"source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["6.4.40"],"introduced":["6.1.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":"pkg:composer/symfony/html-sanitizer","source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["7.4.12"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":null,"source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["7.4.12"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":"pkg:composer/symfony/html-sanitizer","source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["8.0.12"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":null,"source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["8.0.12"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":"pkg:composer/symfony/html-sanitizer","source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["6.4.40"],"introduced":["6.1.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["6.4.40"],"introduced":["6.1.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["7.4.12"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["7.4.12"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["8.0.12"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-qc95-4862-92fh"},{"ecosystem":"Packagist","fixed":["8.0.12"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-qc95-4862-92fh"}],"prev":{"headline":"Symfony: UrlGenerator Route-Requirement Bypass via Unanchored Regex Alternation → Off-Site //host URL Injection","id":"CVE-2026-45065"},"products":["html-sanitizer","symfony"],"published":"2026-07-14","related":[{"cvss_score":9.8,"headline":"Improper Input Validation in Symfony","id":"CVE-2019-11325","kev_date_added":null,"published":"2019-11-21"},{"cvss_score":9.8,"headline":"Symfony Incorrect Access Control","id":"CVE-2017-11365","kev_date_added":null,"published":"2019-05-23"},{"cvss_score":9.8,"headline":"Invalid HTTP method overrides allow possible XSS or other attacks in Symfony","id":"CVE-2019-10913","kev_date_added":null,"published":"2019-05-16"},{"cvss_score":9.8,"headline":"Symfony Authentication Bypass","id":"CVE-2018-11407","kev_date_added":null,"published":"2018-06-13"},{"cvss_score":9.8,"headline":"Symfony Authentication Bypass","id":"CVE-2016-2403","kev_date_added":null,"published":"2017-02-07"},{"cvss_score":9.1,"headline":"Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator","id":"CVE-2026-45063","kev_date_added":null,"published":"2026-07-14"},{"cvss_score":8.8,"headline":"Symfony: OidcTokenHandler Accepts JWTs Missing aud/iss/exp Claims","id":"CVE-2026-45069","kev_date_added":null,"published":"2026-07-14"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"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":"2026-07-16","vendors":["symfony"]},"summary":"Attackers can bypass Symfony HtmlSanitizer host allowlists via URL parsing differences and area tag misclassification, allowing off-allowlist links.","url":"https://insights.sbomify.com/CVE-2026-45066/"}