What is CVE-2021-42867?

CVE-2021-42867 is a medium-severity vulnerability in Htmly, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2022-03-31.

How severe is CVE-2021-42867?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Htmly

CVE-2021-42867

A Cross Site Scripting (XSS) vulnerability exists in DanPros htmly 2.8.1 via the Description field in (1) admin/config, and (2) index.php pages.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-03-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% 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

Htmly — versions 2.8.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

rlsec.xyz/vulns/ (Third Party Advisory)
rlsec.xyz/vulns/CVE_2021_42867.html (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-42867?: CVE-2021-42867 is a medium-severity vulnerability in Htmly, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2022-03-31.
How severe is CVE-2021-42867?: Medium severity. CVSS v3 base score is 4.8 out of 10.