What is CVE-2020-26134?

CVE-2020-26134 is a medium-severity vulnerability in Livehelperchat Live Helper Chat, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-10-02.

How severe is CVE-2020-26134?

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

XSS in Livehelperchat Live Helper Chat

CVE-2020-26134

Live Helper Chat before 3.44v allows stored XSS in chat messages with an operator via BBCode.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-10-02 · 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 (63.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.8% 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

Livehelperchat Live Helper Chat

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

livehelperchat.com/3.44v-security-update-and-few-other-bits-586a.html (Vendor Advisory)
github.com/LiveHelperChat/livehelperchat/commit/a131b937dd6a87271ed1c0c8b8deb87… (Patch, Third Party Advisory)
github.com/rekter0/exploits/tree/master/CVE-2020-26134 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-26134?: CVE-2020-26134 is a medium-severity vulnerability in Livehelperchat Live Helper Chat, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-10-02.
How severe is CVE-2020-26134?: Medium severity. CVSS v3 base score is 6.1 out of 10.