{"answers":{"affected":"1 open source package ship an affected version, including html_sanitize_ex. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-66370 in the wild and no public exploit code.","fix":"Upgrade html_sanitize_ex to a fixed version for your release line: 1.4.5 or 1.5.3.","what":"CVE-2026-66370 is a medium-severity vulnerability in rrrene html_sanitize_ex, published on 6 Aug 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-2026-66370 and fix it if it is affected.\n\nWhat it is: CVE-2026-66370 is a medium-severity vulnerability in rrrene html_sanitize_ex, published on 6 Aug 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-2026-66370 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- html_sanitize_ex (Hex): affected from 0.3.1; fixed in 1.4.5, 1.5.3\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-2026-66370/ (Markdown: https://insights.sbomify.com/CVE-2026-66370/index.md)","id":"CVE-2026-66370","markdown":"https://insights.sbomify.com/CVE-2026-66370/index.md","name":"CVE-2026-66370","record":{"aliases":["EEF-CVE-2026-66370","GHSA-r8xc-fmjg-37c5","GHSA-w3f9-jjhw-wwvq"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Elixir HTML sanitizer","requires_auth":"none","summary":"An attacker can hijack existing forms in sanitized HTML to steal submitted data, including credentials, by injecting form-association attributes.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"EEF","cpe":[{"product":"htmlsanitizeex","vendor":"rrrene"}],"cvss":{"score":4.8,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"description":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the form and formaction attributes on an \u003cinput\u003e element in sanitized HTML. HTML's form attribute associates an input with any form on the page by its id even when the input sits outside that form, and formaction on a submit control overrides the owning form's action. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.\n\nNo script executes. The scrubber allows neither form nor button, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an id.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3.","ecosystems":["Hex"],"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":"html_sanitize_ex HTML5 scrubber keeps attacker-supplied form-association attributes, allowing form hijacking","id":"CVE-2026-66370","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Hex","product":null,"products":[],"type":"open_redirect","year":"2026"},"n_packages":1,"n_references":5,"next":{"headline":"Predictable Seed in Pseudo-Random Number Generator (PRNG) in Digital Watchdog VMAX DVR and NVR Product Lineups","id":"CVE-2026-66372"},"packages":[{"ecosystem":"Hex","fixed":["1.4.5","1.5.3"],"introduced":["0.3.1","1.5.0-rc.0"],"last_affected":[],"package":"html_sanitize_ex","purl":"pkg:hex/html_sanitize_ex","source":"EEF-CVE-2026-66370"}],"prev":{"headline":"MZ Automation libiec61850 Out-of-bounds Read","id":"CVE-2026-66369"},"products":["html_sanitize_ex"],"published":"2026-08-06","related":[{"cvss_score":8.2,"headline":"Quadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion denial of service","id":"CVE-2026-68749","kev_date_added":null,"published":"2026-08-06"},{"cvss_score":8.2,"headline":"Quadratic sibling re-flattening in the html_sanitize_ex traversal engine allows CPU-exhaustion denial of service","id":"CVE-2026-68750","kev_date_added":null,"published":"2026-08-06"},{"cvss_score":2.3,"headline":"html_sanitize_ex HTML5 scrubber keeps attacker-supplied meta refresh, allowing forced cross-origin redirection","id":"CVE-2026-66829","kev_date_added":null,"published":"2026-08-06"},{"cvss_score":2.3,"headline":"html_sanitize_ex HTML5 scrubber keeps attacker-supplied `\u003cobject\u003e` elements, allowing untrusted content embedding","id":"CVE-2026-66843","kev_date_added":null,"published":"2026-08-06"},{"cvss_score":2.3,"headline":"CSS sanitizer allowlist bypass in html_sanitize_ex via non-declaration input","id":"CVE-2026-68747","kev_date_added":null,"published":"2026-08-06"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Erlang Ecosystem Foundation","prefix":"EEF"},{"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":"2026-08-19","vendors":["rrrene"]},"summary":"An attacker can hijack existing forms in sanitized HTML to steal submitted data, including credentials, by injecting form-association attributes.","url":"https://insights.sbomify.com/CVE-2026-66370/"}