{"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-2026-45753 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-2026-45753 is a low-severity cross-site scripting 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-2026-45753 and fix it if it is affected.\n\nWhat it is: CVE-2026-45753 is a low-severity cross-site scripting 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-2026-45753 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-2026-45753/ (Markdown: https://insights.sbomify.com/CVE-2026-45753/index.md)","id":"CVE-2026-45753","markdown":"https://insights.sbomify.com/CVE-2026-45753/index.md","name":"CVE-2026-45753","record":{"aliases":["DEBIAN-CVE-2026-45753","GHSA-hhg7-c65m-h7ff","UBUNTU-CVE-2026-45753"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"Symfony HTML Sanitizer","requires_auth":"none","summary":"Attackers can inject JavaScript via unsanitized URL attributes in Symfony HTML Sanitizer, leading to XSS when specific attributes are enabled.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"symfony","vendor":"sensiolabs"}],"cvss":{"score":2.1,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"},{"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, UrlAttributeSanitizer::getSupportedAttributes() omits URL-valued attributes including action, formaction, poster, and cite, so configurations that admit those attributes can leave javascript: URIs unsanitized and enable XSS when the resulting HTML is rendered or a victim submits a form or clicks a button. 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's HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — `javascript`: URI Survives Sanitization (XSS)","id":"CVE-2026-45753","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"sensiolabs:symfony","products":["sensiolabs:symfony"],"type":"xss","year":"2026"},"n_packages":12,"n_references":5,"next":{"headline":"Symfony: Mailjet Mailer Webhook Parser Never Verifies the Configured Secret — Unauthenticated Webhook Event Injection","id":"CVE-2026-45754"},"packages":[{"ecosystem":"Packagist","fixed":["6.4.40"],"introduced":["6.1.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":null,"source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["6.4.40"],"introduced":["6.1.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":"pkg:composer/symfony/html-sanitizer","source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["7.4.12"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":null,"source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["7.4.12"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":"pkg:composer/symfony/html-sanitizer","source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["8.0.12"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":null,"source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["8.0.12"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/html-sanitizer","purl":"pkg:composer/symfony/html-sanitizer","source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["6.4.40"],"introduced":["6.1.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["6.4.40"],"introduced":["6.1.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["7.4.12"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["7.4.12"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["8.0.12"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-hhg7-c65m-h7ff"},{"ecosystem":"Packagist","fixed":["8.0.12"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-hhg7-c65m-h7ff"}],"prev":{"headline":"Suricata detect/transform: use-after-free in decompress transforms","id":"CVE-2026-45752"},"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":"2026-07-14","vendors":["symfony"]},"summary":"Attackers can inject JavaScript via unsanitized URL attributes in Symfony HTML Sanitizer, leading to XSS when specific attributes are enabled.","url":"https://insights.sbomify.com/CVE-2026-45753/"}