CVE-2026-76239

Medium

Description

Stigmem before 0.9.0a11 fails to validate the delivery_address parameter when creating webhook subscriptions, allowing authenticated users to specify internal loopback and private network destinations. Attackers can trigger matching fact-change events to cause the Stigmem server to issue server-side HTTP POST requests to internal services, enabling blind SSRF attacks against localhost and private network endpoints.

SeverityMedium

CVSS6.3

Exploit probability—

ProductStigmem-node

PublishedAug 19, 2026

First seenAug 19, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

stigmem-node0.9.0a11 or later

Vendor advisories

github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236

Affected products

Product	Affected versions	Fixed in
stigmem-nodePyPI	v < 0.9.0a11	0.9.0a11

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