What is CVE-2020-15071?

CVE-2020-15071 is a medium-severity vulnerability in Getsymphony Symphony, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-08-11.

How severe is CVE-2020-15071?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Getsymphony Symphony

CVE-2020-15071

content/content.blueprintsevents.php in Symphony CMS 3.0.0 allows XSS via fields['name'] to appendSubheading.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-08-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.3% 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

github.com/symphonycms/symphonycms/issues/2917 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-15071?: CVE-2020-15071 is a medium-severity vulnerability in Getsymphony Symphony, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-08-11.
How severe is CVE-2020-15071?: Medium severity. CVSS v3 base score is 6.1 out of 10.