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CVE-2022-23540

25
FAUCET Score

CVE-2022-23540 impacts the auth0 jsonwebtoken library (versions <=8.5.1), allowing signature validation bypass if the 'jwt.verify()' function lacks explicit algorithm definition, defaulting to the insecure 'none' algorithm. This vulnerability carries a CVSS score of 7.6 (HIGH), indicating a network-based attack with low complexity, potentially leading to partial confidentiality, integrity, and availability compromise. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.5.1CPE matchmatch criteria
cpe:2.3:a:auth0:jsonwebtoken:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

6.4MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
1.6
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.53%
Probability of exploitation in next 30 days
EPSS Percentile
41.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0053 is in the 31st percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: jsonwebtokenFixed in: 9.0.0
redhatpatch availablevia redhat_api
Product: RHODF-4.13-RHEL-9Fixed in: odf4/mcg-core-rhel9:v4.13.0-41
View patch
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-console

Vendor Advisories (2)

npmGHSA-qwph-4952-7xr6medium

jsonwebtoken vulnerable to signature validation bypass due to insecure default algorithm in jwt.verify()

Dec 22, 2022
redhatCVE-2022-23540Moderate

jsonwebtoken: Insecure default algorithm in jwt.verify() could lead to signature validation bypass

Dec 22, 2022

References

github.com / auth0/node-jsonwebtoken/commit/e1fa9dcc12054a8681db4e6373da1b30cf7016e3
Patch
github.com / auth0/node-jsonwebtoken/security/advisories/GHSA-qwph-4952-7xr6
Third Party Advisory
security.netapp.com / advisory/ntap-20240621-0007