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Response snapshot Oct 26, 2026, 18:57 UTC

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VulnerabilityCVE-2026-110447Known exploitation

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

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.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
9.2 Critical (CVSS 4.0)
Chance of exploitation
12.3% in the next 30 days
CISA federal deadline
Oct 26, 2026: within 7 days
Sources
4 independent sources

What to do

Check the vendor advisory for affected versions and fixes.

CISA's 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.

Read NVD CVE-2026-110447 (opens a new tab)

What happened

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.

CISA federal deadline

Federal due date within 7 days

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Unknown
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

9.2

Version 4.0As of

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:X/V:X/RE:X/U:X

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

12.3%

Scored Percentile 96.2%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    NVD CVE-2026-110447 (opens a new tab)

    NVD record: description, CVSS, affected products, and a CISA SSVC assessment reporting active exploitation.

    Published Checked

  2. Primary source

    Vendor advisory (via NVD references) (opens a new tab)

    The vendor advisory referenced by the CVE record, for affected versions and fixes.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  5. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  6. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  7. Primary source

    CISA KEV entry CVE-2026-110447 (opens a new tab)

    The CVE-2026-110447 catalog entry establishes known exploitation, date added, required action, and the federal due date; not zero-day status.

    Published Checked

  8. Reporting

    The Hacker News: CISA Flags Two Actively Exploited Critical Flaws in Collabora Online and Arista VeloCloud (opens a new tab)

    The article reports exploitation in the wild (attempted or successful). It is reporting, not independently primary-confirmed.

    Published Checked

  9. Reporting

    The Hacker News syndication feed (opens a new tab)

    The RSS/Atom/RDF entry supplied this exact link and any available title, date, and excerpt.

    Published Date not suppliedChecked

  10. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-110447, scored 2026-10-25. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 26). Collabora Online – Built-in CODE Server OS Command Injection Vulnerability (CVE-2026-110447). https://kevwire.com/record/CVE-2026-110447

MLA

"Collabora Online – Built-in CODE Server OS Command Injection Vulnerability (CVE-2026-110447)." KEVWire, 26 Oct. 2026, kevwire.com/record/CVE-2026-110447.

Chicago

KEVWire. "Collabora Online – Built-in CODE Server OS Command Injection Vulnerability (CVE-2026-110447)." Last modified October 26, 2026. https://kevwire.com/record/CVE-2026-110447.

Evidence summary (plain text)

Collabora Online – Built-in CODE Server OS Command Injection Vulnerability (Oct 14, 2026).
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.
CVSS 9.2 (version 4.0; evidence as of Oct 26, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-110447).
EPSS 12.3% for the following 30 days, scored Oct 25, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-110447&date=2026-10-25).
Sources:
NVD CVE-2026-110447: https://nvd.nist.gov/vuln/detail/CVE-2026-110447
Vendor advisory (via NVD references): https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T16:21:04.749Z&lastModEndDate=2026-10-26T17:50:56.936Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T15:50:57.770Z&lastModEndDate=2026-10-26T17:20:56.094Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T15:21:00.016Z&lastModEndDate=2026-10-26T16:50:55.493Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?pubStartDate=2026-10-12T13:35:55.142Z&pubEndDate=2026-10-26T13:35:55.142Z&resultsPerPage=500&startIndex=2500
CISA KEV entry CVE-2026-110447: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
The Hacker News: CISA Flags Two Actively Exploited Critical Flaws in Collabora Online and Arista VeloCloud: https://thehackernews.com/2026/10/cisa-flags-two-actively-exploited.html
The Hacker News syndication feed: https://feeds.feedburner.com/TheHackersNews
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-110447&date=2026-10-25
Record ID: CVE-2026-110447.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Oct 26, 2026. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 13:40 UTC. Ingestion is not an independent editorial investigation.

NVD status: Analyzed. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

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