{"answers":{"affected":"2 open source packages ship an affected version, including ep_etherpad-lite.","exploited":"There is no known exploitation of CVE-2026-55090 in the wild and no public exploit code.","fix":"Upgrade ep_etherpad-lite to 3.3.0 or later.","what":"CVE-2026-55090 is a medium-severity vulnerability in etherpad, published on 19 Aug 2026."},"fix_prompt":"Check this codebase for CVE-2026-55090 and fix it if it is affected.\n\nWhat it is: CVE-2026-55090 is a medium-severity vulnerability in etherpad, published on 19 Aug 2026. \nExploitation: There is no known exploitation of CVE-2026-55090 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- ep_etherpad-lite (npm): affected all versions; fixed in 3.3.0\n- ep_etherpad-lite (npm): affected all versions; fixed in 3.3.0\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-2026-55090/ (Markdown: https://insights.sbomify.com/CVE-2026-55090/index.md)","id":"CVE-2026-55090","markdown":"https://insights.sbomify.com/CVE-2026-55090/index.md","name":"CVE-2026-55090","record":{"aliases":["GHSA-2jp7-wwpg-3p9w"],"analysis":null,"analysis_generated_by":null,"assigner":"GitHub_M","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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"}],"description":"Etherpad is a real-time collaborative editor. Prior to 3.3.0, getHTMLFromAtext in src/node/utils/ExportHtml.ts interpolates values from the exportHtmlAdditionalTagsWithData plugin hook into span data attributes without HTML attribute escaping. A pad editor can place an attacker-controlled value into the attribute pool through moveOpsToNewPool and AttributePool.putAttrib. When a bundled plugin such as ep_font_color or ep_font_size registers the hook, opening the resulting HTML export causes the value to execute as stored cross-site scripting in the Etherpad origin. This issue is fixed in version 3.3.0.","ecosystems":["npm"],"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":"Etherpad: Stored XSS in HTML export via unescaped attribute-pool values","id":"CVE-2026-55090","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"flat-to-nested: Prototype pollution in flat-to-nested convert() via __proto__ parent/id key","id":"CVE-2026-55091"},"packages":[{"ecosystem":"npm","fixed":["3.3.0"],"introduced":["0"],"last_affected":[],"package":"ep_etherpad-lite","purl":null,"source":"GHSA-2jp7-wwpg-3p9w"},{"ecosystem":"npm","fixed":["3.3.0"],"introduced":["0"],"last_affected":[],"package":"ep_etherpad-lite","purl":"pkg:npm/ep_etherpad-lite","source":"GHSA-2jp7-wwpg-3p9w"}],"prev":{"headline":"Etherpad: JWT `admin` claim presence-only check lets non-admin OAuth users invoke every Etherpad HTTP API endpoint","id":"CVE-2026-55089"},"products":["etherpad"],"published":"2026-08-19","related":[],"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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-20","vendors":["ether"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-55090/"}