{"id":"CVE-2026-63466","revision":"9804953a304a4b6ca7afc482c6db21ec","records":[{"revision":"9804953a304a4b6ca7afc482c6db21ec","observedAt":"2026-10-25T15:18:45.851+00:00","statement":{"source":"nvd","id":"CVE-2026-63466","aliases":[],"title":"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…","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.","state":0,"publishedAt":"2026-08-21T19:17:32.117+00:00","modifiedAt":"2026-10-14T19:10:00.297+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","score":4.1,"severity":"MEDIUM"}],"references":["https://github.com/Unleash/unleash/commit/002012cfdbedd2e9b7db9dc83b9f549f761db22e","https://github.com/Unleash/unleash/releases/tag/v8.0.3","https://github.com/Unleash/unleash/security/advisories/GHSA-w4mq-xh27-6xpx"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63466","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-116"],"productCriteria":[],"sourceDates":{"published":"2026-08-21T19:17:32.117","lastModified":"2026-10-14T19:10:00.297"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-63466","identifiers":["CVE-2026-63466"]},"retained":false,"historicalAffected":[]}],"coverage":[]}