Vulnerability identifier: #VU61535

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-26598

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
ImpressCMS
Web applications / CMS

Vendor: The ImpressCMS Project

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions within "/include/findusers.php" file. A remote attacker can bypass implemented security restrictions and obtain sensitive information about application users.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ImpressCMS: 1.0.0 - 1.4.2

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External links
http://karmainsecurity.com/KIS-2022-03
http://hackerone.com/reports/1081137

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.