What is CVE-2021-40969?

CVE-2021-40969 is a medium-severity vulnerability in Spotweb Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-10-01.

How severe is CVE-2021-40969?

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

XSS in Spotweb Project

CVE-2021-40969

Cross-site scripting (XSS) vulnerability in templates/installer/step-004.inc.php in spotweb 1.5.1 and below allow remote attackers to inject arbitrary web script or HTML via the firstname parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-10-01 · 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: 0.022 (82.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Spotweb Project

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/spotweb/spotweb (Third Party Advisory)
github.com/spotweb/spotweb/issues/711 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-40969?: CVE-2021-40969 is a medium-severity vulnerability in Spotweb Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-10-01.
How severe is CVE-2021-40969?: Medium severity. CVSS v3 base score is 6.1 out of 10.