What is CVE-2026-21433?

CVE-2026-21433 is a high-severity vulnerability in Emlog, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-01-02.

How severe is CVE-2026-21433?

High severity. CVSS v3 base score is 7.7 out of 10.

SSRF in Emlog

CVE-2026-21433

Emlog is an open source website building system. Versions up to and including 2.5.19 are vulnerable to server-side Out-of-Band (OOB) requests / SSRF via uploaded SVG files. An attacker can upload a crafted SVG to http[:]//emblog/admin/media[.]php which contains external resource references. When the server processes/renders the SVG (thumbnailing, preview, or sanitization), it issues an HTTP request to the attacker-controlled host. Impact: server-side SSRF/OOB leading to internal network probing and potential metadata/credential exposure. As of time of publication, no known patched versions are available.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.003 (19.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Emlog — versions <= 2.5.19

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

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

Frequently asked questions

What is CVE-2026-21433?: CVE-2026-21433 is a high-severity vulnerability in Emlog, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-01-02.
How severe is CVE-2026-21433?: High severity. CVSS v3 base score is 7.7 out of 10.