CVE-2026-23623Public exploitNetwork attack vector

Restricted-file download via unblocked save shortcut

Published Feb 5, 2026 · Updated Feb 5, 2026

Authorization bypass in Collabora Online affected releases allows remote authenticated users to download view-only files via a save shortcut. The web interface processes Ctrl+Shift+S as a save operation even when download controls are removed and the shared-file policy prohibits downloads. Exploitation requires view-only access and affects releases before 23.05.20.1, 24.04.17.3, 25.04.7.5, or CODE 25.04.08.2.

CVSS severity5.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Collabora Online affected releases allows remote authenticated users to download view-only files via a save shortcut. The web interface processes Ctrl+Shift+S as a save operation even when download controls are removed and the shared-file policy prohibits downloads. Exploitation requires view-only access and affects releases before 23.05.20.1, 24.04.17.3, 25.04.7.5, or CODE 25.04.08.2.

The record

CVE
CVE-2026-23623
Published
Feb 5, 2026
Updated
Feb 5, 2026
Vendor
Collabora Productivity
Product
Collabora Online
Classifications
CWE-285, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Collabora Online < 23.05.20.1
  2. Affected versionversion=Collabora Online < 24.04.17.3
  3. Affected versionversion=Collabora Online < 25.04.7.5
  4. Affected versionversion=Collabora Online Development Edition < 25.04.08.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Collabora Productivity · Collabora Onlineversion=Collabora Online < 23.05.20.1; version=Collabora Online < 24.04.17.3; version=Collabora Online < 25.04.7.5; version=Collabora Online Development Edition < 25.04.08.2

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
T1213Data from Information Repositories

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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