Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-70481

CVE-2026-70481MEDIUM

open-webui open-webui — Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  N  L  L    5.4   .0043   34.7     —

AFFECTED
  Product     Versions              Fixed
  open-webui  >= 0.5.0, < 0.11.0 –  —

TIMELINE
  Aug 4   Reserved by GitHub_M
  Aug 4   Published (CNA: GitHub_M)
  Sep 18  EXPLOIT PUBLISHED — CVE-2026-70481 (open-webui). Public exploit reference added.

CWE-284, CWE-862 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.0, the standard channel message update and delete handlers accepted any caller holding write access on the channel without checking that the caller wrote the message. Because write access is the same grant a member needs to post, any ordinary participant in a shared standard channel could rewrite or permanently delete another participant message, while group and direct message handlers enforced authorship. This issue is fixed in 0.11.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 4, 2026	Reserved	Reserved by GitHub_M
August 4, 2026	Published	Published (CNA: GitHub_M)
September 18, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-70481 (open-webui). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
open-webui	open-webui	—	>= 0.5.0, < 0.11.0	—

Weaknesses

CWE-284 · CWE-862

References (4)

https://github.com/open-webui/open-webui/commit/c609ec41154fa092fa0af80d9d365de06b666286 [Patch]
https://github.com/open-webui/open-webui/pull/27197 [Patch, Vendor Advisory]
https://github.com/open-webui/open-webui/releases/tag/v0.11.0 [Release Notes]
https://github.com/open-webui/open-webui/security/advisories/GHSA-mj5r-jf49-m3w7 [Exploit, Patch, Vendor Advisory]

Authoritative record: CVE-2026-70481 at cve.org

Vendors: open-webui

Weaknesses: CWE-284 · CWE-862

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-70481 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.