In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL.
CVSS 3.1MEDIUM 5.9·Network·No auth·No interaction·EPSS 0.01015·Published 2020-10-05·Fixed in 3.3.0CWE-203