CVE-2023-5057 ActivityPub for WordPress < 1.0.0 - Contributor+ Stored XSS

Q: What is CVE-2023-5057?

CVE-2023-5057 is a medium-severity cross-site scripting vulnerability in Unknown ActivityPub, published on 16 Oct 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Q: Is CVE-2023-5057 being exploited?

There is no known exploitation of CVE-2023-5057 in the wild and no public exploit code.

Q: How do I fix CVE-2023-5057?

No fix has been published for CVE-2023-5057 yet. Limit exposure of the affected software until one is available.

Medium 5.4 Published 16 Oct 2023 Updated 2 Aug 2024

Contributors can inject malicious scripts via unescaped metadata in ActivityPub mentions, leading to stored XSS attacks.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2023-5057?

CVE-2023-5057 is a medium-severity cross-site scripting vulnerability in Unknown ActivityPub, published on 16 Oct 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

The ActivityPub WordPress plugin before 1.0.0 does not escape user metadata before outputting them in mentions, which could allow users with a role of Contributor and above to perform Stored XSS attacks

Which versions are affected by CVE-2023-5057?

It affects 1 product.

Products include Automattic Activitypub.

How do I fix CVE-2023-5057?

No fix has been published for CVE-2023-5057 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2023-5057 being exploited?

There is no known exploitation of CVE-2023-5057 in the wild and no public exploit code.

Sources

Also known as GHSA-rcgg-pr6j-3pmh.