Vulnerability · Published Mar 16, 2026 · Assigned by VulnCheck

CVE-2026-29516Buffalo TeraStation TS5400R Excessive File Permissions Information Disclosure

Medium 4.9

In plain English

A medium-severity incorrect permission assignment in TeraStation NAS TS5400R from Buffalo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).

Severity (CVSS 3.1)4.9Medium

Exploit odds (30 days)0.5%top 54.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Buffalo TeraStation NAS TS5400R firmware version 4.02-0.06 and prior contain an excessive file permissions vulnerability that allows authenticated attackers to read the /etc/shadow file by uploading and executing a PHP file through the webserver. Attackers can exploit world-readable permissions on /etc/shadow to retrieve hashed passwords for all configured accounts including root.

Affected products (as reported)

Vendor	Product	Versions
Buffalo	TeraStation NAS TS5400R	0 – through 4.02-0.06

Weakness: CWE-732 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

References

https://buffaloamericas.com/ product
https://www.vulncheck.com/advisories/buffalo-terastation-ts5400r-excessive-file-permissions-information-disclosure third-party-advisory