What is CVE-2017-20026?

CVE-2017-20026 is a medium-severity vulnerability in Humhub, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 4.3/10. Published 2022-06-09.

How severe is CVE-2017-20026?

Medium severity. CVSS v3 base score is 4.3 out of 10.

XSS in Humhub

CVE-2017-20026

A vulnerability has been found in HumHub up to 1.0.1 and classified as problematic. Affected by this vulnerability is an unknown functionality. The manipulation leads to cross site scripting (Reflected). The attack can be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.1.1 is able to address this issue. It is recommended to upgrade the affected component.

Published 2022-06-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Humhub
Unspecified Humhub — versions 1.0.1, 1.0.0

Weakness classification (CWE)

References

seclists.org/fulldisclosure/2017/Mar/47 (Exploit, Patch, Mailing List, Third Party Advisory)
vuldb.com/ (Third Party Advisory)

Frequently asked questions

What is CVE-2017-20026?: CVE-2017-20026 is a medium-severity vulnerability in Humhub, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 4.3/10. Published 2022-06-09.
How severe is CVE-2017-20026?: Medium severity. CVSS v3 base score is 4.3 out of 10.