What is CVE-2018-20837?

CVE-2018-20837 is a medium-severity vulnerability in Typesettercms Typesetter, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2019-05-09.

How severe is CVE-2018-20837?

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

XSS in Typesettercms Typesetter

CVE-2018-20837

include/admin/Menu/Ajax.php in Typesetter 5.1 has index.php/Admin/Menu/Ajax?cmd=AddHidden title XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-05-09 · 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 (52.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.6% 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

Typesettercms Typesetter — versions 5.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.netsparker.com/web-applications-advisories/ns-18-026-reflected-cross-site-s… (Exploit, Third Party Advisory)
github.com/Typesetter/Typesetter/commit/fd637e2919e7f77c498a91a8e9d353f8e12afc9a (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-20837?: CVE-2018-20837 is a medium-severity vulnerability in Typesettercms Typesetter, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2019-05-09.
How severe is CVE-2018-20837?: Medium severity. CVSS v3 base score is 4.8 out of 10.