Server-Side Request Forgery in UTMStack Affects Internal and Cloud Metadata Access
CVE-2026-82040

5.3MEDIUM

Key Information:

Vendor

Utmstack

Status
Utmstack
Vendor
CVE Published:
2 October 2026

What is CVE-2026-82040?

UTMStack versions prior to 11.2.16 are vulnerable to a server-side request forgery (SSRF) that allows authenticated attackers to exploit the IdentityProviderService's validateMetadataUrl() function. By submitting a malicious metadata URL to the identity-providers endpoint, attackers can manipulate the server into making requests to arbitrary internal or cloud metadata services. This presents a significant risk, enabling potential internal network port scans and unauthorized access to sensitive instance-metadata information without proper validation of the target host or IP address.

Affected Version(s)

UTMStack 0 < 11.2.16

References

https://github.com/UTMStack/UTMStack/releases/tag/v11.2.16
release-notes
https://github.com/utmstack/UTMStack/commit/4e7a727c3b8d8...
patch
https://www.vulncheck.com/advisories/utmstack-ssrf-via-id...
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Adam Nurudini (QwesiRED)
VulnCheck
.