Most recent entries from all

cnvd-2020-43155

2026-10-26T13:46:12.209737+00:00

cnvd-2020-43155

EUVD-2026-40324

2026-10-26T13:46:12.209768+00:00

EUVD-2026-40324

fkie_cve-2020-11083

2026-10-26T13:46:12.209783+00:00

In October from version 1.0.319 and before version 1.0.466, a user with access to a markdown FormWidget that stores data persistently could create a stored XSS attack against themselves and any other users with access to the generated HTML from the field. This has been fixed in 1.0.466. For users of the RainLab.Blog plugin, this has also been fixed in 1.4.1.

GHSA-w4pj-7p68-3vgv — Stored XSS in October

2026-10-26T13:46:12.209811+00:00

Affected: Packagist: october/backend

### Impact A user with access to a markdown FormWidget that stores data persistently could create a stored XSS attack against themselves and any other users with access to the generated HTML from the field.

### Patches Issue has been patched in Build 466 (v1.0.466) & RainLab.Blog v1.4.1 by restricting the ability to store JS in markdown to only users that have been explicitly granted the `backend.allow_unsafe_markdown` permission.

### Workarounds Apply https://github.com/octobercms/october/commit/9ecfb4867baae14a0d3f99f5b5c1e8a979ae8746 & https://github.com/rainlab/blog-plugin/commit/6ae19a6e16ef3ba730692bc899851342c858bb94 to your installation manually if unable to upgrade to Build 466 or v1.4.1 of RainLab.Blog (if using that plugin).

### References Reported by [Sivanesh Ashok](https://stazot.com/)

### For more information If you have any questions or comments about this advisory: * Email us at [hello@octobercms.com](mailto:hello@octobercms.com)

### Threat assessment:

gsd-2020-11083

2026-10-26T13:46:12.209847+00:00

gsd-2020-11083