Nango through 0.70.4 fails to validate caller-supplied connection configuration values interpolated into provider token and proxy URL templates. Authenticated attackers can supply malicious configuration values to direct server requests at internal addresses or cloud metadata endpoints, potentially exfiltrating provider credentials.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/NangoHQ/nango
disclosure@vulncheck.com
https://github.com/NangoHQ/nango/blob/v0.70.4/packages/shared/lib/utils/utils.ts
disclosure@vulncheck.com
https://github.com/NangoHQ/nango/security/advisories/GHSA-hgjm-c252-ccxx
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/nango-through-0.70.4-server-side-request-f…
disclosure@vulncheck.com