CVE-2015-9235

highpriority · attend · 52OT risk · highEPSS 0.085 · 95 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

4 exploits · PoC

Likely / severe?

8.52% (95th) EPSS

CVSS 7.5 · high

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-26

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).

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.09.3criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-327USprimaryCWE-20USCWE-20US

exploits (4)

Public proof-of-concept and weaponised exploit code.

affected products (3)

Products and version ranges known to be affected.

HackerOne jsonwebtoken node module≤ <4.2.2enisa_euvdEU
auth0 jsonwebtoken< 4.2.2nvdUScpe:2.3:a:auth0:jsonwebtoken:*:*:*:*:*:*:*:*
npm jsonwebtoken< 4.2.2osvUSpkg:npm/jsonwebtoken

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-c7hr-j4mj-j2w6Verification Bypass in jsonwebtoken2018-10-09ghsa · osvUS
Versions 4.2.1 and earlier of `jsonwebtoken` are affected by a verification bypass vulnerability. This is a result of weak validation of the JWT algorithm type, occuring when an attacker is allowed to arbitrarily specify the JWT algorithm. ## Recommendation Update to version 4.2.2 or later.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2018-05-29modified 2026-06-17

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references (12)

External citations — patches, advisories, analysis.

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