CVE-2026-44564 - Open WebUI: Read-Only Users Can Modify Collaborative Documents via Socket.IO

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MEDIUM

Open WebUI: Read-Only Users Can Modify Collaborative Documents via Socket.IO

Published May 15, 2026

5.4

MEDIUM

CVSS 3.1

EPSS 0.32%

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the ydoc:document:update Socket.IO event handler checks whether the sender is a member of the document's Socket.IO room (line 678) but does not verify that the sender has write permission. Users with read-only access join the document room via ydoc:document:join, which only requires read permission (line 520). Once in the room, the user can emit ydoc:document:update events that modify the in-memory Yjs document state and are broadcast to all other collaborators in real time. This vulnerability is fixed in 0.9.0.

Affected products

Vendor Open-Webui Product Open-Webui Default
n/a
- Version
  < 0.9.0
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Open-Webui

n/a

Version	Status	Constraints
< 0.9.0	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-863

Incorrect Authorization

References (4)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30616
Advisory
https://github.com/advisories/GHSA-vrfh-rj4q-rmhr
Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-vrfh-rj4q-rmhr
x_refsource_CONFIRMExploitVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-44564

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30616		Advisory
https://github.com/advisories/GHSA-vrfh-rj4q-rmhr		Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-vrfh-rj4q-rmhr		x_refsource_CONFIRMExploitVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-44564