{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2026-42090 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-42090 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-42090 is a critical cross-site scripting vulnerability in streetwriters notesnook, published on 4 May 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-2026-42090 and fix it if it is affected.\n\nWhat it is: CVE-2026-42090 is a critical cross-site scripting vulnerability in streetwriters notesnook, published on 4 May 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-2026-42090 in the wild and no public exploit code.\n\nAffected product: streetwriters notesnook. 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-2026-42090/ (Markdown: https://insights.sbomify.com/CVE-2026-42090/index.md)","id":"CVE-2026-42090","markdown":"https://insights.sbomify.com/CVE-2026-42090/index.md","name":"CVE-2026-42090","record":{"aliases":["GHSA-fjm8-jg78-89h4"],"analysis":{"component_type":"desktop_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Notesnook desktop app","requires_auth":"none","summary":"Attackers can achieve remote code execution in the Notesnook desktop app via stored XSS in note exports due to unsafe HTML rendering and Electron configuration.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"notesnook_desktop","vendor":"streetwriters"},{"product":"notesnook_mobile","vendor":"streetwriters"}],"cvss":{"score":9.6,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-94","name":"Improper Control of Generation of Code"},{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Notesnook is a note-taking app focused on user privacy \u0026 ease of use. Prior to Notesnook Web/Desktop version 3.3.15 and prior to Notesnook iOS/Android version 3.3.20, a stored XSS vulnerability in the note export flow can be escalated to remote code execution in the desktop app. The root cause is that exported note fields such as title, headline, and content are inserted into the generated HTML template without HTML escaping. When the note is later exported to PDF, Notesnook renders that HTML into a same-origin, unsandboxed iframe using iframe.srcdoc = .... Injected script executes in the Notesnook origin. In the desktop app, this becomes RCE because Electron is configured with nodeIntegration: true and contextIsolation: false. This issue has been patched in Notesnook Web/Desktop version 3.3.15 and Notesnook iOS/Android version 3.3.20.","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":"Notesnook: RCE via stored XSS in note export rendering","id":"CVE-2026-42090","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"goshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS","id":"CVE-2026-42091"},"packages":[],"prev":{"headline":"yeoman-environment Vulnerable to Arbitrary Package Installation without User Confirmation","id":"CVE-2026-42089"},"products":["notesnook"],"published":"2026-05-04","related":[{"cvss_score":9.7,"headline":"Notesnook vulnerable to RCE via stored XSS in Web Clipper rendering","id":"CVE-2026-33976","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":8.6,"headline":"Notesnook vulnerable to RCE via stored XSS in Note History diff viewer","id":"CVE-2026-33955","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":5.4,"headline":"Notesnook has Stored XSS via unsanitized Twitter/X embed URL in editor (`tweetToEmbed`)","id":"CVE-2026-31876","kev_date_added":null,"published":"2026-03-11"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"total"},"state":"PUBLISHED","updated":"2026-05-05","vendors":["streetwriters"]},"summary":"Attackers can achieve remote code execution in the Notesnook desktop app via stored XSS in note exports due to unsafe HTML rendering and Electron configuration.","url":"https://insights.sbomify.com/CVE-2026-42090/"}