CVE-2020-15249: Stored XSS by authenticated backend user with access to upload files
First published: Mon Nov 23 2020(Updated: )
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October CMS from version 1.0.319 and before version 1.0.469, backend users with access to upload files were permitted to upload SVG files without any sanitization applied to the uploaded files. Since SVG files support being parsed as HTML by browsers, this means that they could theoretically upload Javascript that would be executed on a path under the website's domain (i.e. /storage/app/media/evil.svg), but they would have to convince their target to visit that location directly in the target's browser as the backend does not display SVGs inline anywhere, SVGs are only displayed as image resources in the backend and are thus unable to be executed. Issue has been patched in Build 469 (v1.0.469) & v1.1.0.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Octobercms October | >=1.0.319<1.0.469 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is CVE-2020-15249?
CVE-2020-15249 is a vulnerability in the October CMS that allows backend users to upload SVG files without any sanitization.
How does CVE-2020-15249 affect October CMS?
CVE-2020-15249 affects October CMS versions 1.0.319 to 1.0.469, allowing backend users with file upload access to upload SVG files without sanitization.
What is the severity of CVE-2020-15249?
CVE-2020-15249 has a severity rating of 5.4 (Medium).
How can I fix CVE-2020-15249?
To fix CVE-2020-15249, you should update your October CMS installation to version 1.0.469 or later.
Which CWE category does CVE-2020-15249 belong to?
CVE-2020-15249 belongs to CWE category 79 (Improper Neutralization of Input During Web Page Generation).
- collector/nvd-index
- agent/references
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/title
- agent/weakness
- agent/last-modified-date
- agent/author
- agent/severity
- agent/remedy
- agent/tags
- agent/description
- agent/event
- agent/first-publish-date
- vendor/octobercms
- canonical/octobercms october
- version/octobercms october/1.0.319