What is CVE-2020-29539?

CVE-2020-29539 is a medium-severity vulnerability in Systransoft Pure Neural Server, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-12-08.

How severe is CVE-2020-29539?

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

XSS in Systransoft Pure Neural Server

CVE-2020-29539

A Cross-Site Scripting (XSS) issue in WebUI Translation in Systran Pure Neural Server before 9.7.0 allows a threat actor to have a remote authenticated user run JavaScript from a malicious site.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-12-08 · 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 (49.7th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% 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

Systransoft Pure Neural Server

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.systransoft.com/translation-products/systran-pure-neural-server/ (Product)
grave-rose.medium.com/two-systran-vulnerabilities-and-their-exploits-8bc83ba29e… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-29539?: CVE-2020-29539 is a medium-severity vulnerability in Systransoft Pure Neural Server, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-12-08.
How severe is CVE-2020-29539?: Medium severity. CVSS v3 base score is 5.4 out of 10.