Authorization bypass in October CMS

1) Improper Authorization

EUVDB-ID: #VU57098

Risk: Medium

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-41126

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a remote user to compromise the affected application.

The vulnerability exists due to improper authorization. An attacker who previously had an administrative account with access to the admin interface is able to sign in to the backend using October CMS v2.0 even after the account has been deleted.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

October CMS: 2.1.11

External links

http://github.com/octobercms/october/security/advisories/GHSA-6gjf-7w99-j7x7/

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.