SEPTEMBER 18, 2026
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Case File

CVE-2026-76239

MEDIUM · CVSS 6.3 EPSS 0.27% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-19 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

The vulnerability allows authenticated users to manipulate the delivery_address parameter when creating webhook subscriptions, potentially directing server-side HTTP POST requests to internal loopback and private network destinations. This could lead to blind Server-Side Request Forgery (SSRF) attacks, compromising internal services. Organizations using Stigmem versions prior to 0.9.0a11 should prioritize patching to mitigate the risk of unauthorized access to sensitive internal resources.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-76239
Severity
MEDIUM
CVSS
6.3
EPSS
0.27%

Original NVD 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.