What is CVE-2026-21430?

CVE-2026-21430 is a critical-severity vulnerability in Emlog, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-01-02.

How severe is CVE-2026-21430?

Critical severity. CVSS v3 base score is 9.3 out of 10.

XSS in Emlog

CVE-2026-21430

Emlog is an open source website building system. In version 2.5.23, article creation functionality is vulnerable to cross-site request forgery (CSRF). This can lead to a user being forced to post an article with arbitrary, attacker-control…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (4.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

Affected products

Emlog — versions 2.5.23, = 2.5.23

Weakness classification (CWE)

CWE-79 — Cross-site Scripting
CWE-352 — Cross-Site Request Forgery (CSRF)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21430?: CVE-2026-21430 is a critical-severity vulnerability in Emlog, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-01-02.
How severe is CVE-2026-21430?: Critical severity. CVSS v3 base score is 9.3 out of 10.