Mark-of-the-Web bypass in WinRAR

1) Product UI does not warn user of unsafe actions

EUVDB-ID: #VU106931

Risk: Medium

CVSSv4.0: 4.5 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-31334

CWE-ID: CWE-356 - Product UI does not Warn User of Unsafe Actions

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to software does not display a warning for files when opening a symbolic link that points to an executable file. A remote attacker can bypass "Mark of the Web" feature and trick the victim into executing malicious files.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WinRAR: 3.20 - 7.11 beta 1

CPE2.3

• cpe:2.3:a:rarlab:winrar:3.20:*:*:*:*:*:*:*
• cpe:2.3:a:rarlab:winrar:4.00:*:*:*:*:*:*:*
• cpe:2.3:a:rarlab:winrar:4.01:*:*:*:*:*:*:*

External links

https://jvn.jp/en/jp/JVN59547048/index.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted archive.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.