CVE-2021-26918 Information

Description

DISPUTED The ProBot bot through 2021-02-08 for Discord might allow attackers to interfere with the intended purpose of the \Send an image when a user joins the server\ feature (or possibly have unspecified other impact) because the uploader web service allows double extensions (such as .html.jpg) with the text/html content type. NOTE: there may not be cases in which an uploader web service is customer controlled; however the nature of the issue has substantial interaction with customer controlled configuration. NOTE: the vendor states \This is just an uploader (like any other one) which uploads files to cloud storage and accepts various file types. There is no kind of vulnerability and it won’t compromise either the client side or the server side.\

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://raw.githubusercontent.com/TheLastVvV/Vulnerability-Reports-and-CVE/main/Reports/Discord%20Probot%20-%20Unrestricted%20File%20Upload.txt http://packetstormsecurity.com/files/161347/Discord-Probot-Arbitrary-File-Upload.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8