Nextcloud Server before 9.0.55 and 10.0.2 suffers from a error message disclosing existence of file in write-only share.

published 2017-04-05 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-1239

cvss: 4.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a error message disclosing existence of file in write-only share. Due to an error in the application logic an adversary with access to a write-only share may enumerate the names of existing files and subfolders by comparing the exception messages.

Patch / fix

fixed in 1 links 1

nextcloud nextcloud_server 9.0.55, 10.0.2

nextcloud.com/security/advisory/?id=nc-sa-2017-003 advisory

Exploit prediction

0.90% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	4.0	AV:N/AC:L/Au:S/C:P/I:N/A:N

Affected products

Nextcloud Nextcloud Server

Classification

Weakness

CWE-209 Generation of Error Message Containing Sensitive Information
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

nextcloud.com /security/advisory/?id=nc-sa-2017-003
broken-link, patch, vendor-advisory
hackerone.com /reports/174524
third-party-advisory

Sources

CVE List CVE-2017-0885
NVD CVE-2017-0885

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary