CVE-2026-87994

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Source
https://cve.org/CVERecord?id=CVE-2026-87994
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87994.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-87994
Aliases
Published
2026-09-09T21:24:55Z
Modified
2026-09-12T03:30:20Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
Open WebUI: Channel members can overwrite another member's message via the chat completions endpoint
Details

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 until 0.11.1, the channel branch of chat_completion in backend/open_webui/main.py checked channel write access and channel membership for a supplied message_id but did not verify that the calling user authored the targeted message. A channel member could use the chat completions endpoint to replace another member's message while preserving the victim as the stored author, altering the conversation record without gaining access to other channels. This issue is fixed in version 0.11.1.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-639",
        "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87994.json"
}
References

Affected packages

Git / github.com/open-webui/open-webui

Affected ranges

Type
GIT
Repo
https://github.com/open-webui/open-webui
Events
Introduced
3660bc00fd807deced3400a63bfa6db47811a3bb
Fixed
7d392bedc9c1aaecc94509a58e59186b614433dc
Fixed
d3e8bf3405e848cfba377814d0aa7ba7290e414d
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0.9.5"
        },
        {
            "fixed": "0.11.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.10.0
v0.10.1
v0.10.2
v0.11.0
v0.9.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87994.json"