Vulnerability identifier: #VU82022

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5561

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WordPress
Web applications / CMS

Vendor: WordPress.ORG

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the "/wp-json/wp/v2/users" REST API endpoin. A remote attacker can disclose email addresses of WordPress users by probing them character by character.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

WordPress: 6.3 - 6.3.1, 6.2 - 6.2.2, 6.1 - 6.1.3, 6.0 - 6.0.5, 5.9 - 5.9.7, 5.8 - 5.8.7, 5.7 - 5.7.9, 5.6 - 5.6.11, 5.5 - 5.5.12, 5.4 - 5.4.13, 5.3 - 5.3.15, 5.2 - 5.2.18, 5.1 - 5.1.16, 5.0 - 5.0.19, 4.9 - 4.9.23, 4.8 - 4.8.22, 4.7 - 4.7.26

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External links
http://wordpress.org/news/2023/10/wordpress-6-3-2-maintenance-and-security-release/
http://wpscan.com/blog/email-leak-oracle-vulnerability-addressed-in-wordpress-6-3-2/
http://wpscan.com/vulnerability/19380917-4c27-4095-abf1-eba6f913b441/

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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.