CVE-2021-26918 File upload in n/a
Attackers can upload malicious files with double extensions to the Discord bot's uploader, potentially enabling code execution or bypassing security controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-26918?
CVE-2021-26918 is a critical vulnerability in n/a, published on 9 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-434
Which versions are affected by CVE-2021-26918?
It affects 1 product.
Products include Probot Bot.
How do I fix CVE-2021-26918?
No fix has been published for CVE-2021-26918 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-26918 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-26918 exists.
Sources
Also known as GHSA-ghmj-xphc-2mq4.