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CVE.org (no NVD analysis yet)· CNA mitre

CVE-2026-110447: Collabora Online Built-in CODE Server before 26.4.303 (richdocumentscode), a Nextcloud app, allows remote code execution, as exploited in th

Noroxi assessment

Priority: This week (action score 69/100)

  • CISA has confirmed exploitation in the wild (Oct 23, 2026). Remediation deadline for US federal agencies: Oct 26, 2026.
  • Probability of exploitation in the next 30 days: 11.6% (FIRST EPSS); higher than 96% of all records.
  • This probability rose by 10 points in the last 7 days.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Collabora Collabora Online - Built-in CODE Server 26.4.303.

Don’t wait for the next maintenance window. Upgrade to Collabora Collabora Online - Built-in CODE Server 26.4.303 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

CriticalCVSS 9.2 · v4.0KEVWeaponized Fix available
Published
Oct 14, 2026
Updated
Oct 26, 2026
EPSS
11.6% · 96th percentile▲ 10

Report tools

JSON

Action score

69

This week

Don’t wait for the next maintenance window.

CVSS
36 / 40 · 9.2 / 10
CISA KEV
30 / 30 · Listed
EPSS
3 / 30 · 11.6%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · mitre
9.2
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Oct 23, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Oct 26, 2026.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-110447

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
collaboraonline

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • collabora onlinebefore 26.4.303

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mitre). Independent of NVD's CPE analysis and usually ahead of it.

  • Collabora Collabora Online - Built-in CODE Server

    • before 26.4.303affected · semver

Same product

collabora: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-32744Unauthenticated attacker could gain access to currently open files
    30Monitor
  • CVE-2025-66208Configuration-Dependent RCE (OS Command Injection) in richdocumentscode proxy
    29Monitor
  • CVE-2024-45045JavaScript Injection via url encoded values in links in Collabora Office Android
    24Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-43817Dec 13, 2021 · Reflected Cross-Site-Scripting vulnerability in Collabora Online
    24Monitor
  • ← EarlierCVE-2023-31145May 15, 2023 · Reflected XSS vulnerability in CollaboraOnline
    24Monitor
  • ← EarlierCVE-2024-25114Mar 11, 2024 · Sensitive Information Disclosure (JailID) to users in Collabora Online
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Collabora Collabora Online - Built-in CODE Server26.4.303Vendor (CNA)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-10-14

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoCsame day
  2. Published
  3. Fix recordedsame day
  4. CISA KEV+9 d
  5. TodayOct 28, 2026+14 d
EPSS, last 120 days+10% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-66208315 days apartConfiguration-Dependent RCE (OS Command Injection) in richdocumentscode proxy
    29Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS 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: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

nvd-secondary

Root cause

User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.

The bug in code

The whole CWE-78 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
const host = req.body.host;exec("ping -c 1 " + host, onResult);

Fixed

ts
const host = req.body.host;if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);execFile("ping", ["-c", "1", host], onResult);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitationnone → active
  2. Exploit maturitypoc → weaponized
  3. KEV✗ → ✓
  4. Exploit maturitynone → poc
  5. SSVC exploitation— → none
  6. Exploit maturity— → none
  7. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records