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CVE-2023-48238

24
FAUCET Score

CVE-2023-48238 is a high-severity algorithm confusion vulnerability affecting the joaquimserafim/json-web-token JavaScript library. The flaw allows an attacker to forge JWT tokens by manipulating the algorithm field, specifically when the application uses the RS256 algorithm. This unauthenticated attack, with low complexity, could lead to high integrity impact by allowing an attacker to bypass authentication or authorization checks. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.1.1CPE matchmatch criteria
cpe:2.3:a:joaquimserafim:json_web_token:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.30%
Probability of exploitation in next 30 days
EPSS Percentile
22.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0030 is in the 5th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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 (2)

npmpatch availablevia ghsa
Product: json-web-tokenFixed in: 4.0.0
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-4xw9-cx39-r355high

json-web-token library is vulnerable to a JWT algorithm confusion attack

Nov 17, 2023

References

github.com / joaquimserafim/json-web-token/commit/b6e56b1346f48432d29133c76b65222ad93956b7
github.com / joaquimserafim/json-web-token/security/advisories/GHSA-4xw9-cx39-r355
ExploitVendor Advisory