{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-84942 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-84942 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-84942 is a medium-severity cross-site scripting vulnerability in AWS Amazon OpenSearch Service, published on 8 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-84942 and fix it if it is affected.\n\nWhat it is: CVE-2026-84942 is a medium-severity cross-site scripting vulnerability in AWS Amazon OpenSearch Service, published on 8 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-84942 in the wild and no public exploit code.\n\nAffected product: AWS Amazon OpenSearch Service. 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-2026-84942/ (Markdown: https://insights.sbomify.com/CVE-2026-84942/index.md)","id":"CVE-2026-84942","markdown":"https://insights.sbomify.com/CVE-2026-84942/index.md","name":"CVE-2026-84942","record":{"aliases":["GHSA-r4c3-6c67-qqwx"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenSearch Dashboards","requires_auth":"low_privilege","summary":"Authenticated attackers can execute arbitrary JavaScript in other users' browsers by saving crafted Vega visualizations due to improper input validation.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"AMZN","cpe":[],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Improper input validation in the Vega expression function implementation in OpenSearch Dashboards allows a remote authenticated actor with dashboard write permissions to execute arbitrary JavaScript in the context of other users' browser sessions by saving a crafted Vega visualization. The checkForFunctionProperty validation routine failed to recurse into arrays of objects, allowing a function property nested inside an array to bypass validation.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Stored Cross-Site Scripting via Vega Expression Function Bypass in OpenSearch Dashboards","id":"CVE-2026-84942","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"undici vulnerable to response truncation via oversized chunked responses in the dump interceptor","id":"CVE-2026-84947"},"packages":[],"prev":{"headline":"Omada Controller XML External Entity (XXE) Injection in SAML IdP Metadata Parsing Leading to Arbitrary Local File Read","id":"CVE-2026-84941"},"products":["Amazon OpenSearch Service","OpenSearch Dashboards"],"published":"2026-09-08","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":"total"},"state":"PUBLISHED","updated":"2026-09-09","vendors":["AWS","OpenSearch"]},"summary":"Authenticated attackers can execute arbitrary JavaScript in other users' browsers by saving crafted Vega visualizations due to improper input validation.","url":"https://insights.sbomify.com/CVE-2026-84942/"}