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CVE-2026-63004— Unleash: 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

CVSS 5.5 · Medium EPSS 0.27% · P20

Affected Version Matrix 3

VendorProductVersion RangeStatus
Unleashunleash< 7.5.2affected
>= 7.6.0, < 7.6.5affected
>= 8.0.0, < 8.0.2affected
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I. Basic Information for CVE-2026-63004

Vulnerability Information
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Vulnerability Title
Unleash: 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
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
Unleashunleash < 7.5.2 -

II. Public POCs for CVE-2026-63004

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III. Intelligence Information for CVE-2026-63004

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Vendor Advisories for CVE-2026-63004 (1)

Vendor Pages for CVE-2026-63004 (3)

Same Patch Batch · Unleash · 2026-08-21 · 3 CVEs total

CVE-2026-634627.5 HIGHUnleash: Unauthenticated single-request DoS via OpenAPI validation error formatter
CVE-2026-634664.1 MEDIUMUnleash: Global Mustache.escape override disables HTML escaping process-wide, enabling Sla

IV. Related Vulnerabilities

Same product: unleash
Same vendor: Unleash
Same weakness: CWE-918

V. Comments for CVE-2026-63004

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