CVE-2025-41756: high-severity vulnerability in MBS UBR-01 Mk II
Arbitrary Write with ubr-editfile
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.1epss 0.4%
In short
A remote attacker with low privileges can exploit a hidden API function to write any file on the server, potentially compromising the entire system.
Technical detail
The wwwubr.cgi endpoint exposes an undocumented ubr-editfile method that lacks proper access controls, allowing unauthenticated or low-privileged remote attackers to write arbitrary files to the filesystem. This CWE-1242 vulnerability bypasses intended security boundaries and can be leveraged for code execution or configuration tampering.
Summary generated and translated by AI from the official description.
A low-privileged remote attacker can exploit the ubr-editfile method in wwwubr.cgi, an undocumented and unused API endpoint to write arbitrary files on the system.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Related CVEs — MBS UBR-01 Mk II
In the same product, most dangerous first.
CVE-2025-41758HIGHArbitrary Write with wwwupload.cgiEPSS 0.6%CVE-2025-41757HIGHArbitrary Write with ubr-restoreEPSS 0.6%CVE-2025-41755MEDIUMArbitrary Read with ubr-logreadEPSS 0.6%CVE-2025-41766HIGHStack buffer overflow on parsing web requestEPSS 0.5%CVE-2025-41764CRITICALUnchecked role in wwwupdate.cgiEPSS 0.4%CVE-2025-41754MEDIUMArbitrary Read with ubr-editfileEPSS 0.4%