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CVE-2016-10555

24
FAUCET Score

CVE-2016-10555 affects jwt-simple versions 0.3.0 and earlier, stemming from a lack of algorithm enforcement in the jwt.decode() function. This allows an attacker to specify the algorithm, potentially tricking the server into using an RSA public key as an HMAC private key, leading to arbitrary data forgery. Rated as MEDIUM severity (CVSS 6.5), it is network-exploitable with low attack complexity and high integrity impact. While it has a high EPSS score and FAUCET Risk Score, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.3.0CPE matchmatch criteria
cpe:2.3:a:jwt-simple_project:jwt-simple:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.90%
Probability of exploitation in next 30 days
EPSS Percentile
91.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0490 is in the 97th percentile among its peer group of 21,924 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: jwt-simpleFixed in: 0.3.1

Vendor Advisories (1)

npmGHSA-vgrx-w6rg-8fqfcritical

Forgeable Public/Private Tokens in jwt-simple

Nov 6, 2018

References

auth0.com / blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries
Broken LinkThird Party Advisory
github.com / hokaccha/node-jwt-simple/pull/14
Issue TrackingThird Party Advisory
github.com / hokaccha/node-jwt-simple/pull/16
Issue TrackingThird Party Advisory
nodesecurity.io / advisories/87
Third Party Advisory