CVE-2023-31145 Reflected XSS vulnerability in CollaboraOnline

Medium 4.3 Published 15 May 2023 Updated 22 Jan 2025

Reflected XSS in Collabora Online allows attackers to bypass CSP and perform trivial account takeover via malicious code injection.

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

What is CVE-2023-31145?

CVE-2023-31145 is a medium-severity cross-site scripting vulnerability in CollaboraOnline online, published on 15 May 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Collabora Online is a collaborative online office suite based on LibreOffice technology. This vulnerability report describes a reflected XSS vulnerability with full CSP bypass in Nextcloud installations using the recommended bundle. The vulnerability can be exploited to perform a trivial account takeover attack. The vulnerability allows attackers to inject malicious code into web pages, which can be executed in the context of the victim's browser session. This means that an attacker can steal sensitive data, such as login credentials or personal information, or perform unauthorized actions on behalf of the victim, such as modifying or deleting data. In this specific case, the vulnerability allows for a trivial account takeover attack. An attacker can exploit the vulnerability to inject code into the victim's browser session, allowing the attacker to take over the victim's account without their knowledge or consent. This can lead to unauthorized access to sensitive information and data, as well as the ability to perform actions on behalf of the victim. Furthermore, the fact that the vulnerability bypasses the Content Security Policy (CSP) makes it more dangerous, as CSP is an important security mechanism used to prevent cross-site scripting attacks. By bypassing CSP, attackers can circumvent the security measures put in place by the web application and execute their malicious code. This issue has been patched in versions 22.05.13, 21.11.9, and 6.4.27. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Weakness: CWE-79

Which versions are affected by CVE-2023-31145?

It affects 1 product.

Products include Collabora Online.

How do I fix CVE-2023-31145?

No fix has been published for CVE-2023-31145 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-2023-31145 being exploited?

There is no known exploitation of CVE-2023-31145 in the wild and no public exploit code.

Sources

Also known as GHSA-rqj2-2c2x-gjmm.