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CVE-2018-18531

30
FAUCET Score

CVE-2018-18531 affects kaptcha_project kaptcha 2.3.2, where the CAPTCHA generation uses the insecure Random function instead of SecureRandom. This weakness, categorized as CWE-330, allows remote attackers to bypass access restrictions through brute-force attacks. The vulnerability carries a critical CVSS score of 9.8, indicating high impact on confidentiality, integrity, and availability with low attack complexity and no user interaction required. While no active exploitation, public exploit code, or significant community discussion has been observed, its high FAUCET Risk Score of 78/100 suggests a notable potential for exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
2.3.2CPE matchmatch criteria
cpe:2.3:a:kaptcha_project:kaptcha:2.3.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.47%
Probability of exploitation in next 30 days
EPSS Percentile
71.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0147 is in the 58th percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

mavenGHSA-8q89-pwhh-7wfqcritical

Use of Insufficiently Random Values in penggle:kaptcha

Oct 23, 2018

References

github.com / penggle/kaptcha/issues/3
Third Party Advisory