What is CVE-2020-25343?

CVE-2020-25343 is a medium-severity vulnerability in Getsymphony Symphony, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-10-07.

How severe is CVE-2020-25343?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Getsymphony Symphony

CVE-2020-25343

Cross-site scripting (XSS) vulnerabilities in Symphony CMS 3.0.0 allow remote attackers to inject arbitrary web script or HTML to fields['body'] param via events\event.publish_article.php

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-10-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.6% 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

Getsymphony Symphony — versions 3.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.exploit-db.com/exploits/48773 (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2020-25343?: CVE-2020-25343 is a medium-severity vulnerability in Getsymphony Symphony, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-10-07.
How severe is CVE-2020-25343?: Medium severity. CVSS v3 base score is 5.4 out of 10.