{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-39169 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-39169 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-39169 is a high-severity cross-site scripting vulnerability in misskey-dev misskey, published on 27 Aug 2021. 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-2021-39169 and fix it if it is affected.\n\nWhat it is: CVE-2021-39169 is a high-severity cross-site scripting vulnerability in misskey-dev misskey, published on 27 Aug 2021. 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-2021-39169 in the wild and no public exploit code.\n\nAffected product: misskey-dev misskey. 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-2021-39169/ (Markdown: https://insights.sbomify.com/CVE-2021-39169/index.md)","id":"CVE-2021-39169","markdown":"https://insights.sbomify.com/CVE-2021-39169/index.md","name":"CVE-2021-39169","record":{"aliases":["GHSA-pmmv-jwqh-f5ww"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Misskey microblogging platform","requires_auth":"low_privilege","summary":"Attackers can inject malicious scripts via the web client dialog, potentially stealing API tokens and compromising user accounts.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"misskey","vendor":"misskey"}],"cvss":{"score":8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Misskey is a decentralized microblogging platform. In versions of Misskey prior to 12.51.0, malicious actors can use the web client built-in dialog to display a malicious string, leading to cross-site scripting (XSS). XSS could compromise the API request token. This issue has been fixed in version 12.51.0. There are no known workarounds aside from upgrading.","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":"XSS vulnerability using dialog","id":"CVE-2021-39169","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Improper Encoding or Escaping of Output in Asset Metadata Component","id":"CVE-2021-39170"},"packages":[],"prev":{"headline":"TimelockController vulnerability in OpenZeppelin Contracts","id":"CVE-2021-39168"},"products":["misskey"],"published":"2021-08-27","related":[{"cvss_score":9.3,"headline":"Misskey's Incomplete Patch of CVE-2024-52591 Leads to Forgery of Federated Notes","id":"CVE-2025-25306","kev_date_added":null,"published":"2025-03-10"},{"cvss_score":9.3,"headline":"Misskey's missing signature validation allows arbitrary users to impersonate any remote user.","id":"CVE-2023-49079","kev_date_added":null,"published":"2023-11-29"},{"cvss_score":9.2,"headline":"Misskey lacks proper authorization checks and input validation","id":"CVE-2026-28431","kev_date_added":null,"published":"2026-03-09"},{"cvss_score":9.1,"headline":"Misskey vulnerable to improper authorization when accessing with third-party application","id":"CVE-2023-52139","kev_date_added":null,"published":"2023-12-29"},{"cvss_score":8.8,"headline":"Missing validation allows spoofed profiles in Misskey","id":"CVE-2024-52590","kev_date_added":null,"published":"2024-12-18"},{"cvss_score":8.8,"headline":"Missing validation allows spoofed profiles and notes in Misskey","id":"CVE-2024-52591","kev_date_added":null,"published":"2024-12-18"},{"cvss_score":8.8,"headline":"SQL injection of notes/search-by-tag","id":"CVE-2023-24812","kev_date_added":null,"published":"2023-02-22"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["misskey-dev"]},"summary":"Attackers can inject malicious scripts via the web client dialog, potentially stealing API tokens and compromising user accounts.","url":"https://insights.sbomify.com/CVE-2021-39169/"}