#VU82204 Stored cross-site scripting in ActivityPub - CVE-2023-5057

Vulnerability identifier: #VU82204

Vulnerability risk: Low

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear]

CVE-ID: CVE-2023-5057

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ActivityPub
Web applications / Modules and components for CMS

Vendor: Matthias Pfefferle

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ActivityPub: 0.0.1 - 0.17.0

---

External links
https://wpscan.com/vulnerability/58a63507-f0fd-46f1-a80c-6b1c41dddcf5

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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.