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Vulnerability record · CVE-2021-32744 · published 21 July 2021

CVE-2021-32744: Collabora online insecure direct object reference vulnerability

Collabora · Online

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.

7.5 CVSS 3.1 High EPSS 1.1% · top 37.0% CWE-639 · Insecure direct object reference
7.5CVSS 3.1 base score, v2 5.0
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/CollaboraOnline/online/security/advisories/GHSA-32xj-9x82-q9jw Third Party Advisory
https://github.com/CollaboraOnline/online/security/advisories/GHSA-32xj-9x82-q9jw Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.2CVE-2025-66208Collabora online os command injection vulnerabilityCollabora Online - Built-in CODE Server (richdocumentscode) provides a built-in server with all of the document editing features of Collabora Online.…EPSS 1.1%6.1CVE-2024-45045Collabora online cross-site scripting vulnerabilityCollabora Online is a collaborative online office suite based on LibreOffice technology. In the mobile (Android/iOS) device variants of Collabora Onl…EPSS 0.29%6.1CVE-2023-31145Collabora online cross-site scripting vulnerabilityCollabora Online is a collaborative online office suite based on LibreOffice technology. This vulnerability report describes a reflected XSS vulnerab…EPSS 0.40%6.1CVE-2021-43817Collabora online cross-site scripting vulnerabilityCollabora Online is a collaborative online office suite based on LibreOffice technology. In affected versions a reflected XSS vulnerability was found…EPSS 0.65%6.1CVE-2021-32745Collabora online cross-site scripting vulnerabilityCollabora Online is a collaborative online office suite. A reflected XSS vulnerability was found in Collabora Online prior to version 6.4.9-5. An att…EPSS 0.60%5.3CVE-2024-25114Collabora online information exposure vulnerabilityCollabora Online is a collaborative online office suite based on LibreOffice technology. Each document in Collabora Online is opened by a separate "K…EPSS 0.47%8.4CVE-2026-55255Langflow IDOR in responses endpoint allows cross-user flow executionLangflow before 1.9.1 has an insecure direct object reference in the /api/v1/responses endpoint. An authenticated attacker can supply another user's …KEVEPSS 0.89%analysed

Source: NIST National Vulnerability Database (record CVE-2021-32744), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.