What is CVE-2017-5542?

CVE-2017-5542 is a medium-severity vulnerability in Getsymphony Symphony, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2017-01-20.

How severe is CVE-2017-5542?

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

XSS in Getsymphony Symphony

CVE-2017-5542

Cross-site scripting (XSS) vulnerability in template/usererror.missing_extension.php in Symphony CMS before 2.6.10 allows remote attackers to inject arbitrary web script or HTML via the existing-folder parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2017-01-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Getsymphony Symphony

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.securityfocus.com/bid/95686 (VDB Entry, Third Party Advisory, vdb-entry)
github.com/symphonycms/symphony-2/releases/tag/2.6.10 (Release Notes)
github.com/symphonycms/symphony-2/issues/2639 (Vendor Advisory)

Frequently asked questions

What is CVE-2017-5542?: CVE-2017-5542 is a medium-severity vulnerability in Getsymphony Symphony, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2017-01-20.
How severe is CVE-2017-5542?: Medium severity. CVSS v3 base score is 6.1 out of 10.