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Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M

CVE-2026-63004Unleash: Addon webhook URL is dialed server-side with no internal-address filtering, enabling SSRF to internal services / cloud metadata and exfiltration of configured request headers

Medium 5.5

In plain English

A medium-severity server-side request forgery in unleash from Unleash. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.4%top 67.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
npmunleash-server7.5.2GHSA-5vf6-jrqr-78fj
npmunleash-server7.6.5GHSA-5vf6-jrqr-78fj
npmunleash-server8.0.2GHSA-5vf6-jrqr-78fj

Affected products (as reported)

VendorProductVersions
Unleash unleash < 7.5.2>= 7.6.0, < 7.6.5>= 8.0.0, < 8.0.2

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

References