What is CVE-2020-29137?

CVE-2020-29137 is a medium-severity vulnerability in Cpanel, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-11-27.

How severe is CVE-2020-29137?

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

XSS in Cpanel

CVE-2020-29137

cPanel before 90.0.17 allows self-XSS via the WHM Transfer Tool interface (SEC-577).

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-11-27 · 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: 0.006 (48.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% 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

Cpanel

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

docs.cpanel.net/changelogs/90-change-log/ (Vendor Advisory)
news.cpanel.com/cpanel-tsr-2020-0007-full-disclosure/ (Vendor Advisory)

Frequently asked questions

What is CVE-2020-29137?: CVE-2020-29137 is a medium-severity vulnerability in Cpanel, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-11-27.
How severe is CVE-2020-29137?: Medium severity. CVSS v3 base score is 6.1 out of 10.