What is CVE-2018-5668?

CVE-2018-5668 is a medium-severity vulnerability in Read And Understood Project, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-01-13.

How severe is CVE-2018-5668?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Is CVE-2018-5668 known to be exploited?

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

XSS in Read And Understood Project

CVE-2018-5668

An issue was discovered in the read-and-understood plugin 2.1 for WordPress. XSS exists via the wp-admin/options-general.php rnu_username_validation_title parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-01-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Read And Understood Project — versions 2.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/d4wner/Vulnerabilities-Report/blob/master/read-and-understood.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-5668?: CVE-2018-5668 is a medium-severity vulnerability in Read And Understood Project, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-01-13.
How severe is CVE-2018-5668?: Medium severity. CVSS v3 base score is 4.8 out of 10.
Is CVE-2018-5668 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.