CVE-2026-46499: CollaboraOnline online · Incorrect Authorization
Affects CollaboraOnline onlineSource CVE Database V5
Not known to be exploited · CVSS 4.3 Medium : upgrade to 25.04.11 or 24.04.18 when convenient.
Data as of 30 Oct 2026, 15:33 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 4.3 |
|---|
- Patch
- Available – fixed in 25.04.11, 24.04.18
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 30 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade online and collaboraonline/online to 25.04.11 or 24.04.18.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| CollaboraOnlineonline | Affected
| Fixed in
|
| CollaboraOnlineonline | Affected
| Fixed in
|
GitHubcollaboraonline/onlinepkg:github/collaboraonline/onlineOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade Collabora Online to version 24.04.18 or later, or 25.04.11 or later, where this issue is fixed. No other mitigation is required as the vulnerability is resolved in these releases.
Description
CVE-2026-46499 is an authorization vulnerability in Collabora Online before versions 24.04.18 and 25.04.11. It allows read-only users to bypass the read-only restriction by sending crafted WebSocket messages to execute document-modifying commands. Although these unauthorized changes cannot be saved directly by the attacker and are discarded when the session ends, they can mislead other collaborators or be saved unknowingly by authorized editors sharing the session. This issue has been fixed in the specified versions.