Answer in brief
CVE-2026-63004 records a Medium severity (CVSS 5.5) vulnerability in 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. The current sources do not mark it as known exploited. The current feed maps Unleash/unleash (generic), unleash-server (npm), unleash-server (npm), unleash-server (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Unleash/unleash (generic), unleash-server (npm), unleash-server (npm), unleash-server (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Unleash/unleashgeneric | < 7.5.2 || >= 7.6.0, < 7.6.5 || >= 8.0.0, < 8.0.2 | Not reported |
| unleash-servernpm | <7.5.2 | 7.5.2 |
| unleash-servernpm | >=7.6.0,<7.6.5 | 7.6.5 |
| unleash-servernpm | >=8.0.0,<8.0.2 | 8.0.2 |
Published upstream
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 21, 2026
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.
Quoted source text, attributed separately from HOL analysis.