CVE-2015-9235
CRITICAL 9.8EPSS 8.5%
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
- HackerOne · jsonwebtoken node module
- CVSS v3.0 NVD
- 9.8 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v2.0 NVD
- 7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P - EPSS
- 8.52% chance of exploitation in the next 30 days, 95th percentile
- Published
- 2018-05-29
- Updated
- 2024-09-16
Proof-of-concept exploits (5)
- WinDyAlphA/CVE-2015-9235_JWT_key_confusion3★ · 2023-09-18
- aalex954/jwt-key-confusion-poc2★ · 2022-02-13
- achmadismail173/jwt_exploit5★ · 2025-07-28
- Nxvh1337/CVE-2015-9235_JWT_key_confusion3★ · 2023-09-18
- tierChampion/POC_CVE-2015-92350★ · 2026-03-11
Security advisories
- https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries
- auth0/node-jsonwebtoken/commit/1bb584bc382295eeb7ee8c4452a673a77a68b687
- https://nodesecurity.io/advisories/17
- https://www.timmclean.net/2015/02/25/jwt-alg-none.html
- advisories/GHSA-c7hr-j4mj-j2w6