{"answers":{"affected":"2 open source packages ship an affected version, including unleash-server.","exploited":"There is no known exploitation of CVE-2026-63466 in the wild and no public exploit code.","fix":"Upgrade unleash-server to 8.0.3 or later.","what":"CVE-2026-63466 is a medium-severity cross-site scripting vulnerability in unleash, published on 21 Aug 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-2026-63466 and fix it if it is affected.\n\nWhat it is: CVE-2026-63466 is a medium-severity cross-site scripting vulnerability in unleash, published on 21 Aug 2026. 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-2026-63466 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- unleash-server (npm): affected all versions; fixed in 8.0.3\n- unleash-server (npm): affected all versions; fixed in 8.0.3\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-2026-63466/ (Markdown: https://insights.sbomify.com/CVE-2026-63466/index.md)","id":"CVE-2026-63466","markdown":"https://insights.sbomify.com/CVE-2026-63466/index.md","name":"CVE-2026-63466","record":{"aliases":["GHSA-w4mq-xh27-6xpx","MINI-mp52-g68v-c74g"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["security_bypass","other"],"network_reachable":"yes","non_default_config":false,"product_category":"Unleash feature management","requires_auth":"low_privilege","summary":"Attackers can inject malicious links into Slack or Teams notifications by exploiting disabled HTML escaping in Unleash feature events.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":4.1,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-116","name":"Improper Encoding or Escaping of Output"}],"description":"Unleash is an open-source feature management platform. Prior to 8.0.3, FeatureEventFormatterMd.format in src/lib/addons/feature-event-formatter-md.ts assigns Mustache.escape to an identity function before rendering action and path templates. Because Mustache.escape is process-wide, the assignment disables escaping for subsequent Mustache.render calls in email-service.ts, webhook.ts, datadog.ts, and new-relic.ts. An editor-level user can place Slack or Microsoft Teams link syntax in an unrestricted username, trigger a feature event, and inject an attacker-labeled link into a trusted outbound notification channel, while other Mustache sinks remain unescaped until restart. This issue is fixed in version 8.0.3.","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":"Unleash: Global Mustache.escape override disables HTML escaping process-wide, enabling Slack/Teams link-injection via unrestricted username","id":"CVE-2026-63466","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Vendure affected by external-authentication account takeover: external login linked to a pre-existing account by email without verification","id":"CVE-2026-63472"},"packages":[{"ecosystem":"npm","fixed":["8.0.3"],"introduced":["0"],"last_affected":[],"package":"unleash-server","purl":null,"source":"GHSA-w4mq-xh27-6xpx"},{"ecosystem":"npm","fixed":["8.0.3"],"introduced":["0"],"last_affected":[],"package":"unleash-server","purl":"pkg:npm/unleash-server","source":"GHSA-w4mq-xh27-6xpx"}],"prev":{"headline":"Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`","id":"CVE-2026-63464"},"products":["unleash"],"published":"2026-08-21","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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-21","vendors":["Unleash"]},"summary":"Attackers can inject malicious links into Slack or Teams notifications by exploiting disabled HTML escaping in Unleash feature events.","url":"https://insights.sbomify.com/CVE-2026-63466/"}