CVE-2020-15249 - Stored XSS by authenticated backend user with access to upload files

Back Back to CVE browser

MEDIUM

Stored XSS by authenticated backend user with access to upload files

Published Nov 23, 2020

5.4

MEDIUM

CVSS 3.1

EPSS 0.46%

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.

Affected products

Vendor Octobercms Product October Default
n/a
- Version
  >= 1.0.319, < 1.0.469
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Octobercms

October

n/a

Version	Status	Constraints
>= 1.0.319, < 1.0.469	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-79

Cross-site Scripting (XSS)

References (4)

https://github.com/advisories/GHSA-fx3v-553x-3c4q
Advisory
https://github.com/octobercms/library/commit/80aab47f044a2660aa352450f55137598f362aa4
x_refsource_MISCPatchThird Party Advisory
https://github.com/octobercms/october/security/advisories/GHSA-fx3v-553x-3c4q
x_refsource_CONFIRMThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2020-15249

Link	Providers	Tags
https://github.com/advisories/GHSA-fx3v-553x-3c4q		Advisory
https://github.com/octobercms/library/commit/80aab47f044a2660aa352450f55137598f362aa4		x_refsource_MISCPatchThird Party Advisory
https://github.com/octobercms/october/security/advisories/GHSA-fx3v-553x-3c4q		x_refsource_CONFIRMThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2020-15249