CVE-2023-5561 WordPress < 6.3.2 - Unauthenticated Post Author Email Disclosure

Q: What is CVE-2023-5561?

CVE-2023-5561 is a medium-severity vulnerability in Wordpress Wordpress, published on 16 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Q: Which versions are affected by CVE-2023-5561?

2 open source packages ship an affected version, including wordpress and wordpress-multisite. It affects 1 product.

Q: Is CVE-2023-5561 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-5561 exists.

Q: How do I fix CVE-2023-5561?

Upgrade wordpress to a fixed version for your release line: 4.7.27, 4.8.23, 4.9.24 or 5.0.20.

Medium 5.3 Published 16 Oct 2023 Updated 23 Apr 2025

Unauthenticated attackers can disclose email addresses of users with public posts via REST API search flaws in WordPress.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2023-5561?

CVE-2023-5561 is a medium-severity vulnerability in Wordpress Wordpress, published on 16 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

WordPress does not properly restrict which user fields are searchable via the REST API, allowing unauthenticated attackers to discern the email addresses of users who have published public posts on an affected website via an Oracle style attack

Which versions are affected by CVE-2023-5561?

2 open source packages ship an affected version, including wordpress and wordpress-multisite. It affects 1 product.

Package	Affected	Fixed in
`wordpress` Bitnami	From `4.7.0`	`4.7.27, 4.8.23, 4.9.24, 5.0.20, 5.1.17, 5.2.19, 5.3.16, 5.4.14, 5.5.13, 5.6.12, 5.7.10, 5.8.8, 5.9.8, 6.0.6, 6.1.4, 6.2.3, 6.3.2`
`wordpress-multisite` Bitnami	From `4.7.0`	`4.7.27, 4.8.23, 4.9.24, 5.0.20, 5.1.17, 5.2.19, 5.3.16, 5.4.14, 5.5.13, 5.6.12, 5.7.10, 5.8.8, 5.9.8, 6.0.6, 6.1.4, 6.2.3, 6.3.2`

Products include Wordpress Wordpress.

How do I fix CVE-2023-5561?

Upgrade wordpress to a fixed version for your release line: 4.7.27, 4.8.23, 4.9.24 or 5.0.20.

Is CVE-2023-5561 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-5561 exists.

Public exploit code: 1 Nuclei template and 3 proofs of concept on GitHub.

All Wordpress Wordpress vulnerabilities

Sources

Also known as BIT-wordpress-2023-5561, BIT-wordpress-multisite-2023-5561, DEBIAN-CVE-2023-5561, GHSA-x7w6-3cp2-qjcv, UBUNTU-CVE-2023-5561.