Auth bypass in Collabora Online
CVE-2021-32744
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (64.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Collabora Online
- Collaboraonline Online — versions < 4.2.17-1, >= 6.4.0, < 6.4.9-5
Weakness classification (CWE)
References
- github.com/CollaboraOnline/online/security/advisories/GHSA-32xj-9x82-q9jw (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32744?
- CVE-2021-32744 is a critical-severity vulnerability in Collabora Online, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2021-07-21.
- How severe is CVE-2021-32744?
- Critical severity. CVSS v3 base score is 9.8 out of 10.