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CVE-2026-110447.

Severity, exploit probability and exploitation status for one vulnerability, drawn from NVD, FIRST EPSS and CISA's exploited catalogue.

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known exploited Collabora Online – Built-in CODE Server OS Command Injection Vulnerability

Vendor / product: Collabora - Collabora Online – Built-in CODE Server
Listed by CISA: 2026-10-23
Federal fix deadline: 2026-10-26 (passed)
Required action: 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.

Scores

CVSS 4.0: 9.2 critical 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:X/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:
EPSS: 73.3% estimated probability of exploitation in the next 30 days (higher than 99% of all CVEs)
Weakness class: CWE-78

ATT&CK techniques

inferred from weakness class no curated mapping exists for this CVE; these are the techniques typically seen with CWE-78 vulnerabilities

ReconnaissanceResource DevelopmentInitial Access Execution Persistence Privilege Escalation StealthDefense ImpairmentCredential AccessDiscoveryLateral MovementCollectionCommand and ControlExfiltrationImpact

T1078 Valid Accounts

Initial AccessPersistencePrivilege EscalationStealth

Adversaries may obtain and abuse credentials of existing accounts as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion.

Inferred from CWE-78.

T1078 on attack.mitre.org

T1133 External Remote Services

Initial AccessPersistence

Adversaries may leverage external-facing remote services to initially access and/or persist within a network.

Inferred from CWE-78.

T1133 on attack.mitre.org

T1190 Exploit Public-Facing Application

Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

Inferred from CWE-78.

T1190 on attack.mitre.org

T1059 Command and Scripting Interpreter

Execution

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.

Inferred from CWE-78.

T1059 on attack.mitre.org

T1068 Exploitation for Privilege Escalation

Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

Inferred from CWE-78.

T1068 on attack.mitre.org

T1496 Resource Hijacking

Impact

Adversaries may leverage the resources of co-opted systems to complete resource-intensive tasks, which may impact system and/or hosted service availability.

Inferred from CWE-78.

T1496 on attack.mitre.org

See these techniques on the full ATT&CK matrix.

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.

Published: 2026-10-14
Last modified: 2026-10-24
NVD status: Deferred

References

Covered in Decrypted

Nextcloud's built-in Collabora server was exploited for a month before the advisory (2026-10-24)
Candiru spyware delivered through adverts: when the ad is the exploit (2026-10-17)

CVSS measures how bad exploitation would be; EPSS estimates how likely exploitation is within 30 days; the CISA listing means it is already happening. Read them together: a CVSS 9.8 with EPSS 0.04% is usually less urgent than a CVSS 7.2 on the exploited list. Data: NVD, FIRST EPSS, CISA KEV; detail is cached for a week, scores for a day. ATT&CK techniques come from the CTID KEV mappings project where a curated mapping exists, otherwise they are inferred from the weakness class and labelled as such. ATT&CK is a registered trademark of The MITRE Corporation. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.