CVE-2015-8562 Deserialization in n/a
Remote attackers can execute arbitrary PHP code via unsafe deserialization in the User-Agent header, requiring immediate upgrades.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2015-8562?
CVE-2015-8562 is a high-severity unsafe deserialization vulnerability in Joomla Joomla\!, published on 16 Dec 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Joomla! 1.5.x, 2.x, and 3.x before 3.4.6 allow remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the HTTP User-Agent header, as exploited in the wild in December 2015.
Weakness: CWE-20
Which versions are affected by CVE-2015-8562?
It affects 1 product.
Products include Joomla Joomla\!.
How do I fix CVE-2015-8562?
No fix has been published for CVE-2015-8562 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2015-8562 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2015-8562 exists.
Public exploit code: 1 Metasploit module, 2 Exploit-DB entries, 1 Nuclei template and 11 proofs of concept on GitHub.
Other vulnerabilities in Joomla Joomla\!
- CVE-2016-10033 PHPMailer Command Injection
- CVE-2023-23752 Joomla! Improper Access Control
- CVE-2026-48902 Joomla! Core - [20260518] - Transport encryption downgrade for password and username reset links
- CVE-2025-25226 [20250401] - Joomla Framework - SQL injection vulnerability in quoteNameStr method of Database package
- CVE-2022-23795 [20220303] - Core - User row are not bound to a authentication mechanism
Sources
Also known as GHSA-pccq-v233-rx3q.