Server-Side Request Forgery (SSRF) in Tolgee - #VU166056
Published: November 12, 2026
Vulnerability identifier: #VU166056
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to access internal services and potentially disclose sensitive information through server-side request forgery.
The vulnerability exists due to missing checks for embedded private or loopback IPv4 addresses in Tolgee's UrlSecurity.validateUrl() when validating NAT64, 6to4, or Teredo URLs. A remote user can configure a webhook, LLM provider, or SSO endpoint with a transition-encoded URL such as http://[64:ff9b::a9fe:a9fe]/latest/meta-data/ to reach internal targets where compatible routing exists.
Affected software
Tolgee
Remediation
Install security update from vendor's website.
Tolgee - update to 3.242.5