CVE-2021-24693 Simple Download Monitor < 3.9.5 - Contributor+ Stored Cross-Site Scripting via File Thumbnail

Q: What is CVE-2021-24693?

CVE-2021-24693 is a critical cross-site scripting vulnerability in Unknown Simple Download Monitor, published on 8 Nov 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Q: Is CVE-2021-24693 being exploited?

There is no known exploitation of CVE-2021-24693 in the wild and no public exploit code.

Q: How do I fix CVE-2021-24693?

No fix has been published for CVE-2021-24693 yet. Limit exposure of the affected software until one is available.

Critical 9.0 Published 8 Nov 2021 Updated 3 Aug 2024

Contributors can inject malicious scripts via file thumbnails, potentially leading to admin account creation or plugin installation by reviewers.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-24693?

CVE-2021-24693 is a critical cross-site scripting vulnerability in Unknown Simple Download Monitor, published on 8 Nov 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

The Simple Download Monitor WordPress plugin before 3.9.5 does not escape the "File Thumbnail" post meta before outputting it in some pages, which could allow users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks. Given the that XSS is triggered even when the Download is in a review state, contributor could make JavaScript code execute in a context of a reviewer such as admin and make them create a rogue admin account, or install a malicious plugin

Weakness: CWE-79

Which versions are affected by CVE-2021-24693?

It affects 1 product.

Products include Tipsandtricks-Hq Simple Download Monitor.

How do I fix CVE-2021-24693?

No fix has been published for CVE-2021-24693 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-24693 being exploited?

There is no known exploitation of CVE-2021-24693 in the wild and no public exploit code.

Sources

Also known as GHSA-7pfq-9m7r-jmg6.