CVE-2021-32744 Unauthenticated attacker could gain access to currently open files
Unauthenticated attackers can access files opened by other users by guessing file identifiers, exposing sensitive data in Collabora Online.
- 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-2021-32744?
CVE-2021-32744 is a critical missing authorization vulnerability in CollaboraOnline online, published on 21 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Collabora Online is a collaborative online office suite. In versions prior to 4.2.17-1 and version 6.4.9-5, unauthenticated attackers are able to gain access to files which are currently opened by other users in the Collabora Online editor. For successful exploitation the attacker is required to guess the file identifier - the predictability of this file identifier is dependent on external file-storage implementations (this is a potential "IDOR" - Insecure Direct Object Reference - vulnerability). Versions 4.2.17-1 and 6.4.9-5 contain patches for this issue. There is no known workaround except updating the Collabora Online application to one of the patched releases.
Weakness: CWE-639
Which versions are affected by CVE-2021-32744?
It affects 1 product.
Products include Collabora Online.
How do I fix CVE-2021-32744?
No fix has been published for CVE-2021-32744 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-32744 being exploited?
There is no known exploitation of CVE-2021-32744 in the wild and no public exploit code.
Other vulnerabilities in CollaboraOnline online
- CVE-2026-110447 Collabora Online – Built-in CODE Server OS Command Injection
- CVE-2021-43817 Reflected Cross-Site-Scripting vulnerability in Collabora Online
- CVE-2021-32745 Reflected Cross-Site-Scripting vulnerability
- CVE-2025-66208 Configuration-Dependent RCE (OS Command Injection) in richdocumentscode proxy
- CVE-2024-45045 JavaScript Injection via url encoded values in links in Collabora Office Android