What is CVE-2020-29133?

CVE-2020-29133 is a medium-severity vulnerability in Coremail Xt Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-11-27.

How severe is CVE-2020-29133?

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

Is CVE-2020-29133 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Coremail Xt Project

CVE-2020-29133

jsp/upload.jsp in Coremail XT 5.0 allows XSS via an uploaded personal signature, as demonstrated by a .jpg.html filename in the signImgFile parameter.

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: 0.011 (63.9th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Coremail Xt Project — versions 5.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/fa1c0n1/fa1c0n-vim/blob/master/temp/core_tmp.md (Third Party Advisory, Broken Link)

Frequently asked questions

What is CVE-2020-29133?: CVE-2020-29133 is a medium-severity vulnerability in Coremail Xt Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-11-27.
How severe is CVE-2020-29133?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2020-29133 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.