CVE-2026-81421: Server-Side Request Forgery in ddfourtwo sentry-selfhosted-mcp
Description
CVE-2026-81421 is a server-side request forgery (SSRF) vulnerability in ddfourtwo sentry-selfhosted-mcp version 0.4.0. The flaw exists in an unknown function of the raw_sentry_api component where manipulation of the 'endpoint' argument allows remote attackers to perform SSRF. The vulnerability has a CVSS 4.0 base score of 6.9, indicating medium severity. Exploit code has been publicly released, but there is no vendor response or patch available at this time.
CVSS v4.0
Score 6.9medium
Affected software
ddfourtwo
sentry-selfhosted-mcp
cpe:2.3:a:ddfourtwo:sentry-selfhosted-mcp:*:*:*:*:*:*:*:*AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in ddfourtwo sentry-selfhosted-mcp 0.4.0 involves improper validation of the 'endpoint' argument in the raw_sentry_api component, enabling remote attackers to conduct server-side request forgery. SSRF can allow attackers to make the server perform unintended requests, potentially accessing internal resources or services. The issue was responsibly disclosed but remains unpatched, and public exploit code is available.
Potential Impact
Successful exploitation allows an unauthenticated remote attacker to induce the server to send crafted requests to arbitrary destinations. This can lead to unauthorized internal network scanning, information disclosure, or interaction with internal services not otherwise accessible. The CVSS score of 6.9 reflects a medium impact with low complexity and no required privileges or user interaction.
Mitigation Recommendations
No official fix or patch is currently available, and the vendor has not responded to the issue report. Users should monitor the vendor's communications for updates. Until a patch is released, consider implementing network-level controls to restrict outbound requests from the affected service to trusted destinations only, as a temporary mitigation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-08-26T19:05:40.944Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8f86fcacd9273b4994709e
Added to database: 08/27/2026, 00:38:20 UTC
Last enriched: 09/10/2026, 09:38:17 UTC
Last updated: 10/10/2026, 18:48:23 UTC
Views: 139
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