What is CVE-2026-71249?

CVE-2026-71249 is a medium-severity vulnerability in 299ko, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-05.

How severe is CVE-2026-71249?

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

XSS in 299ko

CVE-2026-71249

299Ko's public contact form (plugin/contact/controllers/ContactController.php, home) sets raw POST field values (name, firstname, email, message) into the page template with no sanitization. The template engine's variable output function (common/Template.php, _show_var) echoes values with no htmlspecialchars call, and the sink template (contact.tpl) outputs these values unescaped into an HTML attribute and a textarea.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (4.5th percentile) — read the EPSS interpretation.

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.

Affected products

299ko — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-71249?: CVE-2026-71249 is a medium-severity vulnerability in 299ko, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-05.
How severe is CVE-2026-71249?: Medium severity. CVSS v3 base score is 6.1 out of 10.