CVE-2015-9235
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...
- Published
- May 29, 2018
- Updated
- Sep 16, 2024
- Assigning CNA
- hackerone
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.0
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 93.1%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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).
Sources
3automate CVE-2015-9235 exploitation
JWT Key Confusion PoC (CVE-2015-9235) Written for the Hack the Box challenge - Under Construction
Demo of the algorithm confusion attack on various JWT libraries
Responsible use
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