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CVE-2018-1000531

23
FAUCET Score

CVE-2018-1000531 affects Inversoft prime-jwt versions prior to commit abb0d479389a2509f939452a6767dc424bb5e6ba, stemming from a CWE-20 vulnerability in the JWTDecoder.decode function. This flaw allows for incorrect signature validation of JSON Web Tokens (JWTs) when an attacker crafts a token using the "none" algorithm. The vulnerability carries a CVSS v3.0 score of 7.5 (High), indicating it can be exploited remotely with low complexity, potentially leading to high integrity impact without requiring user interaction. 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
<= 1.3.0CPE matchmatch criteria
cpe:2.3:a:inversoft:prime-jwt:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/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
3.0

Exploit Intelligence

EPSS Score
1.63%
Probability of exploitation in next 30 days
EPSS Percentile
73.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0163 is in the 56th 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

Remediation records are not available for this CVE.

References

github.com / inversoft/prime-jwt/issues/3
Third Party Advisory