{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-18420 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-18420 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-18420 is a high-severity code injection vulnerability in AWS Amazon OpenSearch Service, published on 20 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-18420 and fix it if it is affected.\n\nWhat it is: CVE-2026-18420 is a high-severity code injection vulnerability in AWS Amazon OpenSearch Service, published on 20 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-18420 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-2026-18420/ (Markdown: https://insights.sbomify.com/CVE-2026-18420/index.md)","id":"CVE-2026-18420","markdown":"https://insights.sbomify.com/CVE-2026-18420/index.md","name":"CVE-2026-18420","record":{"aliases":["GHSA-jhcc-gw3q-f4pc","GHSA-xmqx-xq2p-8jq2"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenSearch Dashboards","requires_auth":"low_privilege","summary":"Authenticated attackers can execute arbitrary code on OpenSearch Dashboards servers via prototype pollution in the TSVB plugin.","user_interaction":"not_required","vuln_class":"code_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"AMZN","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-1321","name":"Improperly Controlled Modification of Object Prototype Attributes"}],"description":"Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards allows an authenticated remote user to execute arbitrary code on the server via a crafted JSON payload to the metrics visualization API endpoint. This issue is a form of prototype pollution that enables remote code execution. \n\nTo remediate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later.","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":"RCE via Prototype Pollution in OpenSearch Dashboards","id":"CVE-2026-18420","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"code_injection","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Missing authorization in Concrete CMS","id":"CVE-2026-18421"},"packages":[],"prev":{"headline":"Out-of-bounds read when the zbus proxy agent IPC backend logs a rejected peer frame's channel name","id":"CVE-2026-18418"},"products":["Amazon OpenSearch Service","OpenSearch Dashboards"],"published":"2026-08-20","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":"2026-08-25","vendors":["AWS","OpenSearch"]},"summary":"Authenticated attackers can execute arbitrary code on OpenSearch Dashboards servers via prototype pollution in the TSVB plugin.","url":"https://insights.sbomify.com/CVE-2026-18420/"}