CVE-2015-9235: AUTH0 Jsonwebtoken

Critical severity, CVSS 9.8. EPSS: 8.5% chance of exploitation in the next 30 days.

In jsonwebtoken node module before 4.2.2 it is possible for an attacker to bypass verification when a token digitally signed with an asymmetric key (RS/ES family) of algorithms but instead the attacker send a token digitally signed with a symmetric algorithm (HS* family).

Affected products

• AUTH0 Jsonwebtoken: before 4.2.2 (fixed in 4.2.2)

Published 2018-05-29. Last modified 2026-06-17.