What’s Vulnerable › Vulnerabilities

CVE-2021-39223: File path disclosure of shared files in Richdocuments application

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-25 · updated 2026-06-17
• Weakness: CWE-200

Description

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Richdocuments application prior to versions 3.8.6 and 4.2.3 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. (e.g. an attacker could see that the file `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the Richdocuments application is upgraded to 3.8.6 or 4.2.3. As a workaround, disable the Richdocuments application in the app settings.

Affected products

• nextcloud Richdocuments: before 3.8.6; from 4.0.0 before 4.2.3 — fixed in 3.8.6, 4.2.3

How to fix

Upgrade to a fixed version: nextcloud Richdocuments 3.8.6, 4.2.3. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/richdocuments/pull/1760
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-rjcc-4cgj-6v93
• https://hackerone.com/reports/1253460
• https://github.com/nextcloud/richdocuments/pull/1760
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-rjcc-4cgj-6v93
• https://hackerone.com/reports/1253460

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