{"id":"CVE-2026-70492","published":"2026-08-04T21:16:38.190","lastModified":"2026-08-05T16:17:02.890","description":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, src/lib/components/chat/Messages/Markdown/KatexRenderer.svelte could store and render a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. The catch branch fell back to inserting the original math source into the page as HTML through {@html} rather than as text, so script in the message runs in the browser of whoever views it, including shared chats and channels. The viewer's session token in localStorage can be stolen, and an administrator viewer can have their account taken over. This issue is fixed in 0.11.0.","cvssScore":8.7,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","cwes":["CWE-79"],"vendors":[],"products":[],"references":[{"url":"https://github.com/open-webui/open-webui/commit/bc600d3f085802c45aa8f38c30e6e8c986bde6cc","tags":[]},{"url":"https://github.com/open-webui/open-webui/pull/26718","tags":[]},{"url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-pwxh-7358-jq2x","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-pwxh-7358-jq2x","tags":[]}],"exploitRefs":[{"url":"https://github.com/open-webui/open-webui/commit/bc600d3f085802c45aa8f38c30e6e8c986bde6cc","tags":[]},{"url":"https://github.com/open-webui/open-webui/pull/26718","tags":[]},{"url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-pwxh-7358-jq2x","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-pwxh-7358-jq2x","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows a malicious chat message to execute arbitrary scripts in the browser of the viewer, potentially leading to session token theft and account compromise.","exploitability":"Exploitation requires a user to view a malicious chat message. The attacker must have the ability to inject such a message into the chat system.","blast_radius":"If exploited, the impact is high, as it can lead to session token theft and account takeover for both individual users and administrators.","remediation":"Upgrade to version 0.11.0 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","web","auth-bypass","chat","katex"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-30T09:26:17.007Z"}}