Lychee is a free, open-source photo-management tool. Prior to 7.7.0, GET /docs/api exposes the Scramble-generated OpenAPI documentation configured by config/scramble.php to unauthenticated callers after installation, with observed response size and latency suggesting that the schema is regenerated without an application-level cache. A remote attacker can repeatedly request the unthrottled route to consume server CPU and obtain a detailed map of the API surface and parameter schema.
This issue is fixed in version 7.7.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/LycheeOrg/Lychee/commit/711f4290f53cd980cd5baa2434c734d364e9…
security-advisories@github.com
https://github.com/LycheeOrg/Lychee/pull/4510
security-advisories@github.com
https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.0
security-advisories@github.com
https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-xg8r-4pm3-2h4f
security-advisories@github.com