CVE-2026-108546 Spotweb through 1.5.8 OS Command Injection via Spot Title in Runcommand Integration
Remote attackers can execute arbitrary OS commands on Spotweb servers by publishing Usenet spots with malicious titles containing shell metacharacters.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-108546?
CVE-2026-108546 is a high-severity command injection vulnerability in spotweb, published on 10 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Spotweb through 1.5.8 contains an OS command injection vulnerability in the runcommand NZB handler that allows remote attackers to execute commands by publishing spots with malicious titles. Attackers can post self-signed spots over Usenet with shell metacharacters in the title, which are substituted unescaped for $SPOTTITLE and passed to exec() when a user downloads the spot, running commands as the Spotweb PHP process.
Weakness: CWE-78
Which versions are affected by CVE-2026-108546?
How do I fix CVE-2026-108546?
No fix has been published for CVE-2026-108546 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-108546 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108546 exists.
Sources
Also known as GHSA-3cfw-8vg9-xhxx, UBUNTU-CVE-2026-108546.