What is CVE-2023-5098?

CVE-2023-5098 is a high-severity vulnerability in Fatcatapps Campaign Monitor Optin Cat, classified under CWE-284 IMPROPER ACCESS CONTROL. CVSS score: 8.1/10. Published 2023-10-31.

How severe is CVE-2023-5098?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2023-5098 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Fatcatapps Campaign Monitor Optin Cat

CVE-2023-5098

The Campaign Monitor Forms by Optin Cat WordPress plugin before 2.5.6 does not prevent users with low privileges (like subscribers) from overwriting any options on a site with the string "true", which could lead to a variety of outcomes, including DoS.

Published 2023-10-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (45.8th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Fatcatapps Campaign Monitor Optin Cat
Campaign Monitor Forms By Optin Cat — versions 0

Public proof-of-concept exploits

20142995/nuclei-templates

References

wpscan.com/vulnerability/3167a83c-291e-4372-a42e-d842205ba722 (Exploit, technical-description, Third Party Advisory, exploit, vdb-entry)

Frequently asked questions

What is CVE-2023-5098?: CVE-2023-5098 is a high-severity vulnerability in Fatcatapps Campaign Monitor Optin Cat, classified under CWE-284 IMPROPER ACCESS CONTROL. CVSS score: 8.1/10. Published 2023-10-31.
How severe is CVE-2023-5098?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2023-5098 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.