Description
Collabora Online Built-in CODE Server before 26.4.303 (richdocumentscode), a Nextcloud app, allows remote code execution, as exploited in the wild in September and October 2026, a different vulnerability than CVE-2025-66208. This is an OS command injection in proxy.php when the CODE server isn't running (e.g., the product was recently restarted). The vulnerability is not present in standalone Collabora Online servers; only this deployment with CODE Server is affected.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Collabora | Collabora Online - Built-in CODE Server | < 26.4.303 | 26.4.303 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 4 repositories
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CyRouteWolf/cve-2026-110447-poc ★ 2 · Oct 29, 2026
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maxprog-svg/CVE-2026-110447 ★ 0 · Nov 2, 2026
CVE-2026-110447 — Collabora Online "Built-in CODE Server"
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Iceman2050/cve-2026-110447-checker ★ 0 · Oct 15, 2026
Free CLI: check a Nextcloud instance for CVE-2026-110447 exposure. Stdlib only, honest verdicts. By Ingenious AI.
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adriyansyah-mf/cve-2026-110447 ★ 0 · Oct 14, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Collabora Built-in CODE Server < 26.4.303 - OS Command Injection http/cves/2026/CVE-2026-110447.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.