Vulnerability · Published Aug 5, 2026 · Assigned by TuranSec

CVE-2026-70374HashBrown CMS - OS Command Injection in Media Upload Thumbnail Generation

High 8.8

In plain English

A high-severity OS command injection in hashbrown-cms from HashBrownCMS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 79% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)1.9%top 20.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

HashBrown CMS through 1.4.6 contains an OS Command Injection vulnerability (CWE-78) in the media upload thumbnail generation routine. Media.generateThumbnail in src/Server/Entity/Resource/Media.js builds a temporary file path as 'thumbnail' + Path.extname(filename) and passes it, unescaped, into a shell command executed via AppService.exec ('convert ' + tempFile + ...).

Affected products (as reported)

Vendor	Product	Versions
HashBrownCMS	hashbrown-cms	0 – through 1.4.6

Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/HashBrownCMS/hashbrown-cms third-party-advisory
https://cve.turansec.uz/advisories/TRN-11FC0D88 third-party-advisory