Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 before 0.10.0, any authenticated user can overwrite the content of a message in a channel they do not belong to (including private and DM channels) by sending a chat completion request with a channel:-prefixed chatid and a target messageid. The channel: path routes pipeline output through makechannelemitter, which writes to the Messages table using the caller-supplied messageid without binding it to the channel. This issue is fixed in version 0.10.0.
{
"cwe_ids": [
"CWE-862"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59714.json",
"cna_assigner": "GitHub_M"
}