CVE-2020-11083 – october/backend

Package

Manager: composer
Name: october/backend
Vulnerable Version: >=1.0.319 <1.0.466

Severity

Level: Low

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00432 pctl0.61839

Details

Stored XSS in October ### 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: <img width="1100" alt="Screen Shot 2020-03-31 at 2 01 52 PM" src="https://user-images.githubusercontent.com/7253840/78070158-8f7ef580-7358-11ea-950c-226533f6a0a3.png">

Metadata

Created: 2020-08-05T14:52:44Z
Modified: 2023-01-31T01:29:13Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/08/GHSA-w4pj-7p68-3vgv/GHSA-w4pj-7p68-3vgv.json
CWE IDs: ["CWE-79"]
Alternative ID: GHSA-w4pj-7p68-3vgv
Finding: F425
Auto approve: 1