Hackers Exploit Critical Collabora Online Flaw to Backdoor Nextcloud Servers
Attackers are exploiting CVE-2026-110447 in Nextcloud's Collabora CODE app to plant web shells.
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CVE-2025-66208
- CVSS 4.0
- 7.2 high
- EPSS
- 1%p63
- Published
- ·
- Modified
Description · NVD
Collabora Online - Built-in CODE Server (richdocumentscode) provides a built-in server with all of the document editing features of Collabora Online. In versions prior to 25.04.702, Collabora Online has a Configuration-Dependent RCE (OS Command Injection) in richdocumentscode proxy. Users of Nextcloud with Collabora Online - Built-in CODE Server app can be vulnerable to attack via proxy.php and an intermediate reverse proxy. This vulnerability is fixed in 25.04.702.
- Vendors
- collabora
- Products
- collabora online - built-in code server
- Weakness
- CWE-78
- Vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
In the news
3 storiesHackers Backdoor Nextcloud Servers Through Critical Flaw in Collabora’s Built-in CODE App
Attackers exploited CVE-2026-110447 in Nextcloud's optional Collabora CODE app to plant web shells.
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Critical Collabora Online Flaw Lets Attackers Execute Commands on Nextcloud Servers
Unauthenticated command injection CVE-2026-110447 in Nextcloud's built-in Collabora CODE Server can run commands as the web user.
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