XSS in Octobercms October
CVE-2020-15249
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.8 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Octobercms October — versions >= 1.0.319, < 1.0.469
Weakness classification (CWE)
References
- github.com/octobercms/library/commit/80aab47f044a2660aa352450f55137598f362aa4 (Patch, Third Party Advisory)
- github.com/octobercms/october/security/advisories/GHSA-fx3v-553x-3c4q (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15249?
- CVE-2020-15249 is a low-severity vulnerability in Octobercms October, classified under Cross-site Scripting. CVSS score: 2.8/10. Published 2020-11-23.
- How severe is CVE-2020-15249?
- Low severity. CVSS v3 base score is 2.8 out of 10.