What is CVE-2018-17300?

CVE-2018-17300 is a medium-severity vulnerability in Cuppacms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-09-21.

How severe is CVE-2018-17300?

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

Is CVE-2018-17300 known to be exploited?

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

XSS in Cuppacms

CVE-2018-17300

Stored XSS exists in CuppaCMS through 2018-09-03 via an administrator/#/component/table_manager/view/cu_menus section name.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-09-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% 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

Cuppacms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

0xT11/CVE-POC

References

github.com/security-breachlock/CVE-2018-17300/blob/master/cuppa_xss.pdf (Exploit, Third Party Advisory)
github.com/CuppaCMS/CuppaCMS/issues/4 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2018-17300?: CVE-2018-17300 is a medium-severity vulnerability in Cuppacms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-09-21.
How severe is CVE-2018-17300?: Medium severity. CVSS v3 base score is 4.8 out of 10.
Is CVE-2018-17300 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.