CVE-2026-63004: Unleash

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Unleash is an open-source feature management platform. Prior to 7.5.2, 7.6.5, and 8.0.2, the addon and integration subsystem passes the operator-controlled parameters.url value from src/lib/addons/webhook.ts and the Slack, Microsoft Teams, Datadog, and New Relic integrations to Addon.fetchRetry in src/lib/addons/addon.ts without restricting loopback, link-local, private, or cloud metadata addresses. An authenticated actor with the root CREATE_ADDON or UPDATE_ADDON permission can cause the server to send requests from inside its network boundary, use integration event status as a blind probing oracle, forward Authorization, customHeaders, or DD-API-KEY values to an attacker-observed host, and deliver the feature-event JSON body to internal services. This issue is fixed in versions 7.5.2, 7.6.5, and 8.0.2.

Affected products

• Unleash Unleash: before 7.5.2 (fixed in 7.5.2); from 7.6.0, before 7.6.5 (fixed in 7.6.5); from 8.0.0, before 8.0.2 (fixed in 8.0.2)

Published 2026-08-21. Last modified 2026-09-09.