CVE-2020-15249

Stored XSS by authenticated backend user with access to upload files

Description

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.

Category

2.8
CVSS
Severity: Low
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.17%
Third-Party Advisory github.com Third-Party Advisory github.com
Affected: octobercms october
Published at:
Updated at:

References

Link Tags
https://github.com/octobercms/library/commit/80aab47f044a2660aa352450f55137598f362aa4 third party advisory patch
https://github.com/octobercms/october/security/advisories/GHSA-fx3v-553x-3c4q third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-15249?
CVE-2020-15249 has been scored as a low severity vulnerability.
How to fix CVE-2020-15249?
To fix CVE-2020-15249, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-15249 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-15249 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-15249?
CVE-2020-15249 affects octobercms october.
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