CVE-2026-111984: AUTOMATIC1111 stable-diffusion-webui cross-site scripting in card builder

CVE-2026-111984 · Severity: medium · CVSS 4.3 · Published 2026-10-18

AUTOMATIC1111 stable-diffusion-webui is a web interface for Stable Diffusion image generation. An attacker can craft a malicious model filename that, when unpacked by a victim, executes arbitrary JavaScript in the WebUI with full access to the victim's session and data when the application loads.

Technologies: AUTOMATIC1111 Stable Diffusion WebUI. Vendors: AUTOMATIC1111.

Quick answers

Is CVE-2026-111984 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-111984 being exploited in the wild.
How severe is CVE-2026-111984?
Medium severity, with a CVSS score of 4.3, published 18 October 2026.
Which products and versions are affected?
AUTOMATIC1111 Stable Diffusion WebUI up to 1.10.1.
Is there a fix for CVE-2026-111984?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-111984 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-111984?
Check whether you run AUTOMATIC1111 Stable Diffusion WebUI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A cross-site scripting vulnerability exists in the create_item_html function of modules/ui_extra_networks.py. The filename parameter is interpolated into HTML attributes without escaping, and the card HTML is inserted via innerHTML in JavaScript, allowing script execution. The attack requires a victim to download and extract a malicious model file, with the payload executed automatically on page load without user interaction.

Affected products

  • AUTOMATIC1111 stable-diffusion-webui up to 1.10.1

Timeline

  • 2026-09-29: disclosed: Issue reported on GitHub
  • 2026-10-18: advisory

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.