What is CVE-2026-1356?

CVE-2026-1356 is a medium-severity vulnerability in Mateuszgbiorczyk Converter For Media – Optimize Images | Convert Webp & Avif, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.8/10. Published 2026-02-12.

How severe is CVE-2026-1356?

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

SSRF in Mateuszgbiorczyk Converter For Media – Optimize Images | Convert Webp & Avif

CVE-2026-1356

The Converter for Media – Optimize images | Convert WebP & AVIF plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 6.5.1 via the PassthruLoader::load_image_source function. This makes it possible for unauthenticated attackers to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.002 (13.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

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

Affected products

Mateuszgbiorczyk Converter For Media – Optimize Images | Convert Webp & Avif — versions 0

Weakness classification (CWE)

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

References

Frequently asked questions

What is CVE-2026-1356?: CVE-2026-1356 is a medium-severity vulnerability in Mateuszgbiorczyk Converter For Media – Optimize Images | Convert Webp & Avif, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.8/10. Published 2026-02-12.
How severe is CVE-2026-1356?: Medium severity. CVSS v3 base score is 4.8 out of 10.