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VulnerabilityPublished

CVE-2026-46499: CollaboraOnline online · Incorrect Authorization

Affects CollaboraOnline onlineSource CVE Database V5

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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

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.14.3
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
CollaboraOnlineonlineAffected
  • >=25.04.0-0 <25.04.11
Fixed in
  • 25.04.11
CollaboraOnlineonlineAffected
  • <24.04.18
Fixed in
  • 24.04.18
GitHubcollaboraonline/onlinepkg:github/collaboraonline/onlineOther threatsAffected
  • <24.04.18
  • >=25.04.0 <25.04.11
Fixed in
  • 24.04.18
  • 25.04.11

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.

References

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