CVE-2026-48909 Joomla Extension - joomshaper.com - PHP Object injection in SP LMS extension for Joomla < 4.1.4
Unauthenticated attackers can execute arbitrary code on the server by sending malicious serialized data in cookies to the SP LMS extension.
- 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-2026-48909?
CVE-2026-48909 is a critical unsafe deserialization vulnerability in joomshaper.net SP LMS extension for Joomla, published on 20 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SP LMS (com_splms) < 4.1.4 by JoomShaper deserializes user-controlled cookie data without validation, enabling an unauthenticated remote attacker to execute arbitrary code on the server.
Weakness: CWE-502
Which versions are affected by CVE-2026-48909?
How do I fix CVE-2026-48909?
No fix has been published for CVE-2026-48909 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-2026-48909 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48909 exists.
Public exploit code: 1 Exploit-DB entry, 1 Nuclei template and 2 proofs of concept on GitHub.
Sources
Also known as GHSA-gf8c-xmwj-whrh.