What is CVE-2018-15843?

CVE-2018-15843 is a medium-severity vulnerability in Get-Simple Getsimple Cms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-08-25.

How severe is CVE-2018-15843?

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

Is CVE-2018-15843 known to be exploited?

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

XSS in Get-Simple Getsimple Cms

CVE-2018-15843

GetSimple CMS 3.3.14 has XSS via the admin/edit.php "Add New Page" field.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-08-25 · 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: 0.006 (47.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% 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

Get-Simple Getsimple Cms — versions 3.3.14

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/GetSimpleCMS/GetSimpleCMS/issues/1293 (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2018-15843?: CVE-2018-15843 is a medium-severity vulnerability in Get-Simple Getsimple Cms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-08-25.
How severe is CVE-2018-15843?: Medium severity. CVSS v3 base score is 4.8 out of 10.
Is CVE-2018-15843 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.