{"apiVersion":"1.0","identifier":"CVE-2026-63466","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.","publishedAt":"2026-08-21T19:17:32","lastModifiedAt":"2026-08-21T22:16:42","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63466","cvssScore":4.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","epssProbability":0.00183,"riskScore":0.42,"affectedProduct":"Unleash","affectedVersions":"<8.0.3","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-63466","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-63466","en":"https://www.redsauce.net/en/cves/CVE-2026-63466","fr":"https://www.redsauce.net/fr/cves/CVE-2026-63466","pt":"https://www.redsauce.net/pt/cves/CVE-2026-63466","de":"https://www.redsauce.net/de/cves/CVE-2026-63466","sk":"https://www.redsauce.net/sk/cves/CVE-2026-63466","el":"https://www.redsauce.net/el/cves/CVE-2026-63466"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-63466"}}