RCE in Spotweb
CVE-2026-108546
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.
Vulnerability class: Command Injection (OS Command Injection)
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind/spotweb-runcommand-title-injection (technical-description, exploit)
- github.com/spotweb/spotweb (product)
- github.com/spotweb/spotweb/blob/1.5.8/lib/services/NzbHandler/Services_NzbHandl… (technical-description)
- www.vulncheck.com/advisories/spotweb-through-1.5.8-os-command-injection-via-spo… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108546?
- CVE-2026-108546 is a high-severity vulnerability in Spotweb, classified under OS Command Injection. CVSS score: 7.5/10. Published 2026-10-10.
- How severe is CVE-2026-108546?
- High severity. CVSS v3 base score is 7.5 out of 10.