Critical (9.1) in manydesigns portofino. EPSS 0.9% chance of exploitation in the next 30 days. Fixed in com.manydesigns:portofino-dispatcher 5.2.1.
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.
Severity
CVSS 3.1
9.1 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS
0.9% chance of exploitation in the next 30 days; higher than 61% of CVEs (scores of 2026-10-31)