CVE-2021-21084 Cross-site scripting in Experience Manager

High 7.3 Published 28 Jun 2021 Updated 17 Sep 2024

Attackers can inject malicious scripts into form fields, leading to arbitrary code execution in victim browsers via stored XSS.

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-2021-21084?

CVE-2021-21084 is a high-severity cross-site scripting vulnerability in Adobe Experience Manager, published on 28 Jun 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

AEM's Cloud Service offering, as well as versions 6.5.7.0 (and below), 6.4.8.3 (and below) and 6.3.3.8 (and below) are affected by a stored Cross-Site Scripting (XSS) vulnerability that could be abused by an attacker to inject malicious scripts into vulnerable form fields. Malicious JavaScript may be executed in a victim’s browser when they browse to the page containing the vulnerable field.

Weakness: CWE-79

Which versions are affected by CVE-2021-21084?

It affects 2 products.

Products include Adobe Experience Manager, Adobe Experience Manager Cloud Service.

How do I fix CVE-2021-21084?

No fix has been published for CVE-2021-21084 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-2021-21084 being exploited?

There is no known exploitation of CVE-2021-21084 in the wild and no public exploit code.

All Adobe Experience Manager vulnerabilities

Sources

Also known as GHSA-8q6h-697m-5v7r.