CVE-2021-39223Network attack vector

File path disclosure via verbatim exception responses

Published Oct 25, 2021 · Updated Aug 4, 2024

Path disclosure in Nextcloud Richdocuments before 3.8.6 and 4.0.0 through 4.2.2 allows remote authenticated users to read shared-file paths. Richdocuments controllers returned caught exception messages verbatim in error responses instead of replacing them with generic messages, exposing the server-side path embedded in a shared-file exception. A low-privileged user must trigger an error while interacting with a shared file, and the resulting disclosure is limited to its server-side path.

CVSS severity4.8
Medium
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path disclosure in Nextcloud Richdocuments before 3.8.6 and 4.0.0 through 4.2.2 allows remote authenticated users to read shared-file paths. Richdocuments controllers returned caught exception messages verbatim in error responses instead of replacing them with generic messages, exposing the server-side path embedded in a shared-file exception. A low-privileged user must trigger an error while interacting with a shared file, and the resulting disclosure is limited to its server-side path.

The record

CVE
CVE-2021-39223
Published
Oct 25, 2021
Updated
Aug 4, 2024
Vendor
Nextcloud GmbH
Product
Nextcloud Security Advisories
Classifications
CWE-200, T1083
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 25, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.8.6,
  2. Affected versionversion=>= 4.0.0, < 4.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Nextcloud Security Advisoriesversion=< 3.8.6,; version=>= 4.0.0, < 4.2.3

Published CVSS scores

5.0NISTAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.8GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1083File and Directory Discovery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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