What is CVE-2020-5299?

CVE-2020-5299 is a medium-severity vulnerability in Octobercms October, classified under Command Injection. CVSS score: 4.0/10. Published 2020-06-03.

How severe is CVE-2020-5299?

Medium severity. CVSS v3 base score is 4.0 out of 10.

RCE in Octobercms October

CVE-2020-5299

In OctoberCMS (october/october composer package) versions from 1.0.319 and before 1.0.466, any users with the ability to modify any data that could eventually be exported as a CSV file from the `ImportExportController` could potentially introduce a CSV injection into the data to cause the generated CSV export file to be malicious. This requires attackers to achieve the following before a successful attack can be completed: 1. Have found a vulnerability in the victims spreadsheet software of choice. 2. Control data that would potentially be exported through the `ImportExportController` by a theoretical victim. 3. Convince the victim to export above data as a CSV and run it in vulnerable spreadsheet software while also bypassing any sanity checks by said software. Issue has been patched in Build 466 (v1.0.466).

Vulnerability class: Command Injection (OS Command Injection)

Published 2020-06-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 61st percentile — 61.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Octobercms October — versions >= 1.0.319, < 1.0.466

Weakness classification (CWE)

CWE-77 — Command Injection

References

github.com/octobercms/october/security/advisories/GHSA-4rhm-m2fp-hx7q (Patch, Third Party Advisory)
github.com/octobercms/library/commit/c84bf03f506052c848f2fddc05f24be631427a1a (Patch, Third Party Advisory)
github.com/octobercms/october/commit/802d8c8e09a2b342649393edb6d3ceb958851484 (Patch, Third Party Advisory)
packetstormsecurity.com/files/158730/October-CMS-Build-465-XSS-File-Read-File-D… (VDB Entry, Third Party Advisory)
seclists.org/fulldisclosure/2020/Aug/2 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2020-5299?: CVE-2020-5299 is a medium-severity vulnerability in Octobercms October, classified under Command Injection. CVSS score: 4.0/10. Published 2020-06-03.
How severe is CVE-2020-5299?: Medium severity. CVSS v3 base score is 4.0 out of 10.