{"id":"CVE-2026-110447","published":"2026-10-14T03:17:20Z","modified":"2026-10-30T16:32:46Z","title":"Collabora Online – Built-in CODE Server OS Command Injection Vulnerability","vendor":"Collabora","product":"Collabora Online – Built-in CODE Server","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"The Built-in CODE Server of Collabora Online, a component of the richdocumentscode Nextcloud app, is affected by an OS command injection flaw in proxy.php that exists in versions before 26.4.303. Standalone Collabora Online servers are not affected; the issue arises only in this CODE Server deployment and when the CODE server is not running, such as shortly after a restart, and an attacker with only network access and no authentication or user interaction can execute commands on the server.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:53:09Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.73307,"percentile":0.9946,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-10-23","dueDate":"2026-10-26","ransomware":false,"requiredAction":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","notes":"https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516 ; https://github.com/CollaboraOnline/online/security/advisories/GHSA-g3vx-3m76-fghh ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-110447","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-10-14","exploitedFirstSeen":"2026-10-14","ransomware":true,"evidence":[{"url":"https://github.com/CollaboraOnline/richdocumentscode/issues/354","date":"2026-10-14"},{"url":"https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516","date":"2026-10-14"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-110447","date":"2026-10-14"},{"url":"https://moje.cert.pl/komunikaty/2026/194/krytyczna-podatnosc-w-collabora-online-dla-nextcloud-aktywnie-wykorzystywana-w-atakach/","date":"2026-10-20"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-10-23"}],"evidenceTotal":5,"provenance":"source"},"exploited":true,"otx":{"pulseCount":13,"pulses":[{"name":"Actively_Exploited_Kev | Oct 31, 2026","url":"https://otx.alienvault.com/pulse/6ae4aefab0c2191cecd41862","created":"2026-10-30"},{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Known_Cve | Oct 22, 2026 | Part 2/4","url":"https://otx.alienvault.com/pulse/6ad8d3466c8181f05516bab7","created":"2026-10-21"},{"name":"Known_Cve | Oct 21, 2026 | Part 3/4","url":"https://otx.alienvault.com/pulse/6ad78144340f998d3db4d0bc","created":"2026-10-20"},{"name":"Known_Cve | Oct 20, 2026 | Part 3/4","url":"https://otx.alienvault.com/pulse/6ad62f761b14c745b837b947","created":"2026-10-19"},{"name":"Known_Cve | Oct 19, 2026 | Part 3/4","url":"https://otx.alienvault.com/pulse/6ad4ddb44d734735b605dc2f","created":"2026-10-18"},{"name":"Known_Cve | Oct 18, 2026 | Part 3/4","url":"https://otx.alienvault.com/pulse/6ad38c34c49c0273168a0f7d","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"references":[{"url":"https://github.com/CollaboraOnline/richdocumentscode/issues/354","tags":["Issue Tracking"]},{"url":"https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-110447","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Remote exploitation of internet-facing proxy.php endpoint","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"allows remote code execution, as exploited in the wild","start":92,"end":146}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: OS command injection yields command execution","mappingType":"primary_impact","evidence":[{"from":"description","quote":"This is an OS command injection in proxy.php","start":225,"end":269}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-100780","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-100780","exploited":true,"exploitedSince":"2026-10-23","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":2,"skipped":1,"earliest":"2026-10-15","earliestUrl":"https://github.com/Iceman2050/cve-2026-110447-checker","repos":[{"name":"CyRouteWolf/cve-2026-110447-poc","url":"https://github.com/CyRouteWolf/cve-2026-110447-poc","stars":2,"created":"2026-10-29"},{"name":"Iceman2050/cve-2026-110447-checker","url":"https://github.com/Iceman2050/cve-2026-110447-checker","stars":0,"created":"2026-10-15"}]},"nuclei":[{"id":"CVE-2026-110447","name":"Collabora Built-in CODE Server < 26.4.303 - OS Command Injection","severity":"critical","path":"http/cves/2026/CVE-2026-110447.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-110447.yaml"}],"first":{"date":"2026-10-15","source":"PoC-in-GitHub","url":"https://github.com/Iceman2050/cve-2026-110447-checker"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2026-10-14","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110447","provenance":"source"},{"date":"2026-10-14","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://github.com/CollaboraOnline/richdocumentscode/issues/354","provenance":"source"},{"date":"2026-10-15","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/Iceman2050/cve-2026-110447-checker","provenance":"source"},{"date":"2026-10-23","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-10-23","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-100780","provenance":"source"}],"speed":{"daysToPublicExploit":1,"firstExploitFrom":"PoC-in-GitHub","daysToKev":9},"priority":{"score":89.4,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 17 days ago"},{"name":"Known ransomware use","points":10.0,"detail":"CISA KEV and VulnCheck KEV: Known"},{"name":"EPSS percentile","points":19.89,"detail":"percentile 0.9946"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"2 PoC-in-GitHub repos; 1 nuclei template"},{"name":"Mentioned in OTX pulses","points":2.6,"detail":"13 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}