Vulnerability · Published Oct 27, 2026 · Assigned by hackerone
CVE-2026-77173
Medium 4.3
In plain English
A medium-severity improper access control in Files Confidential from Nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).
Severity (CVSS 3.0)4.3Medium
Exploit odds (30 days)0.2%top 88.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A user could create a docx or odt file with a # in the filename with confidential information such as a credit card number and have it not be marked as confidential.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Files Confidential | 3.3.0 – through 5.0.0 |
Weakness: CWE-284 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N