GDevelop through 5.6.284 Cookie Leak via LocalFileDownloader Resource URLs

Advisories

GDevelop through 5.6.284 Cookie Leak via LocalFileDownloader Resource URLs

Severity: medium
Date: 10/19/2026
Affecting: GDevelop <= 5.6.284
CVE: CVE-2026-112303
CWE: CWE-522 Insufficiently Protected Credentials
CVSS: 5.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
References: https://github.com/4ian/GDevelop/issues/9257
https://github.com/4ian/GDevelop/commit/fbb01f40a640c35c6064f827065eda00e5608690
https://github.com/4ian/GDevelop/blob/v5.6.284/newIDE/electron-app/app/LocalFileDownloader.js
https://github.com/4ian/GDevelop/blob/v5.6.284/newIDE/app/src/ProjectsStorage/LocalFileStorageProvider/LocalFileResourceMover.js
Credit: George Chen
Description: GDevelop desktop app through 5.6.284 contains a credential leak vulnerability that allows attackers to steal the gd_resource cookie by supplying attacker-controlled resource URLs in project files. Attackers can get victims to open a crafted project, causing downloadLocalFile() to send the cookie to their server and expose private cloud project resources.

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