{"answers":{"affected":"5 open source packages ship an affected version, including openc3. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42086 exists.","fix":"Upgrade openc3 to 7.0.0 or later.","what":"CVE-2026-42086 is a medium-severity cross-site scripting vulnerability in OpenC3 cosmos, published on 4 May 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-2026-42086 and fix it if it is affected.\n\nWhat it is: CVE-2026-42086 is a medium-severity cross-site scripting vulnerability in OpenC3 cosmos, published on 4 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42086 exists.\n\nAffected packages and fixed versions:\n- openc3 (PyPI): affected all versions; fixed in 7.0.0\n- openc3 (PyPI): affected all versions; fixed in 7.0.0\n- openc3 (PyPI): affected all versions; fixed in 7.0.0\n- openc3 (RubyGems): affected all versions; fixed in 7.0.0\n- openc3 (RubyGems): affected all versions; fixed in 7.0.0\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-2026-42086/ (Markdown: https://insights.sbomify.com/CVE-2026-42086/index.md)","id":"CVE-2026-42086","markdown":"https://insights.sbomify.com/CVE-2026-42086/index.md","name":"CVE-2026-42086","record":{"aliases":["GHSA-ffq5-qpvf-xq7x","PYSEC-2026-105"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenC3 COSMOS","requires_auth":"low_privilege","summary":"An attacker can execute arbitrary JavaScript in a victim's browser via self-XSS in the Command Sender, potentially stealing session tokens or modifying data.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"cosmos","vendor":"openc3"}],"cvss":{"score":4.6,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to version 7.0.0, the Command Sender UI uses an unsafe eval() function on array-like command parameters, which allows a user-supplied payload to execute in the browser when sending a command. This creates a self-XSS risk because an attacker can trigger their own script execution in the victim’s session, if allowed to influence the array parameter input, for example via phishing. If successful, an attacker may read or modify data in the authenticated browser context, including session tokens in local storage. This issue has been patched in version 7.0.0.","ecosystems":["PyPI","RubyGems"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"OpenC3 COSMOS: Self-XSS in the Command Sender","id":"CVE-2026-42086","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":5,"n_references":1,"next":{"headline":"OpenC3 COSMOS: SQL Injection in QuestDB Time-Series Data Base","id":"CVE-2026-42087"},"packages":[{"ecosystem":"PyPI","fixed":["7.0.0"],"introduced":["0"],"last_affected":[],"package":"openc3","purl":null,"source":"GHSA-ffq5-qpvf-xq7x"},{"ecosystem":"PyPI","fixed":["7.0.0"],"introduced":["0"],"last_affected":[],"package":"openc3","purl":"pkg:pypi/openc3","source":"GHSA-ffq5-qpvf-xq7x"},{"ecosystem":"PyPI","fixed":["7.0.0"],"introduced":["0"],"last_affected":[],"package":"openc3","purl":"pkg:pypi/openc3","source":"PYSEC-2026-105"},{"ecosystem":"RubyGems","fixed":["7.0.0"],"introduced":["0"],"last_affected":[],"package":"openc3","purl":null,"source":"GHSA-ffq5-qpvf-xq7x"},{"ecosystem":"RubyGems","fixed":["7.0.0"],"introduced":["0"],"last_affected":[],"package":"openc3","purl":"pkg:gem/openc3","source":"GHSA-ffq5-qpvf-xq7x"}],"prev":{"headline":"OpenC3 COSMOS: Arbitrary write to plugins directory via path-traversed config filenames","id":"CVE-2026-42085"},"products":["cosmos"],"published":"2026-05-04","related":[{"cvss_score":9.8,"headline":"Code injection in n/a","id":"CVE-2025-28386","kev_date_added":null,"published":"2025-06-13"},{"cvss_score":9.8,"headline":"Hardcoded credentials in n/a","id":"CVE-2025-28388","kev_date_added":null,"published":"2025-06-13"},{"cvss_score":9.8,"headline":"Weak cryptography in n/a","id":"CVE-2025-28389","kev_date_added":null,"published":"2025-06-13"},{"cvss_score":9.6,"headline":"OpenC3 COSMOS: SQL Injection in QuestDB Time-Series Data Base","id":"CVE-2026-42087","kev_date_added":null,"published":"2026-05-04"},{"cvss_score":9.6,"headline":"OpenC3 COSMOS: Administrative Actions via the Script Runner Tool","id":"CVE-2026-42088","kev_date_added":null,"published":"2026-05-04"},{"cvss_score":9.1,"headline":"OpenC3 COSMOS Vulnerable to Directory Traversal via /script-api/scripts/ endpoint","id":"CVE-2025-28384","kev_date_added":null,"published":"2025-06-13"},{"cvss_score":8.1,"headline":"OpenC3 COSMOS: Hijacked session token can be used to reset password for persistence","id":"CVE-2026-42084","kev_date_added":null,"published":"2026-05-04"}],"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":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-04","vendors":["OpenC3"]},"summary":"An attacker can execute arbitrary JavaScript in a victim's browser via self-XSS in the Command Sender, potentially stealing session tokens or modifying data.","url":"https://insights.sbomify.com/CVE-2026-42086/"}