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CVE-2026-46499— Collabora Online: Read-only session authorization bypass permits live document edits

Quick assessment

Affected
CollaboraOnline online
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Collabora Online 是一款基于 LibreOffice 技术的在线协同办公套件。在 24.04.18 和 25.04.11 版本之前，若干委派给每个文档套件进程中 的文档操作未能正确强制执行会话的只读状态。因此，只读用户（例如具有查看者角色的 WOPI 用户）可以发送特制的 消息，执行用于修改文档的 命令和对话框操作，尽管其界面被限制为只读。这些更改可能误导当前会话中的其他协作者，或者导致拥有编辑权限的会话参与者无意中保存了这些修改。只读攻击者无法直接保存文档，且除非有授权编辑者保存，否则在套件会话结

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-46499

Vulnerability Information
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Vulnerability Title
Collabora Online: Read-only session authorization bypass permits live document edits
Source: CVE Program / CVE List V5
Vulnerability Description
Collabora Online is a collaborative online office suite based on LibreOffice technology. Prior to 24.04.18 and 25.04.11, several document operations delegated to `LibreOfficeKit` in the per-document kit process fail to enforce a session's read-only state. A read-only user, such as a viewer-role WOPI user, can send crafted `WebSocket` messages to execute document-mutating `UNO` commands and dialog operations despite the read-only interface. The changes can mislead co-viewers within the live session, or an authorized editor sharing the session can unknowingly save the modifications. The read-only attacker cannot save the document directly, and changes are discarded when the kit session ends unless an authorized editor saves them. This issue is fixed in versions 24.04.18 and 25.04.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
CollaboraOnline online < 24.04.18 -

II. Public POCs for CVE-2026-46499

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III. Intelligence Information for CVE-2026-46499

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Other References for CVE-2026-46499 (1)

IV. Related Vulnerabilities

Same product: online
Same vendor: CollaboraOnline
Same weakness: CWE-863