Medium severity · published Mar 16, 2026
CVE-2026-29516
Buffalo TeraStation TS5400R Excessive File Permissions Information Disclosure
4.9
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TN
TeraStation NAS TS5400R · Buffalo
through 4.02-0.06 · source: vendor
TN
Terastation Nas Ts5400r Firmware · Buffaloamericas
through 4.02-0.06 · source: NVD