CVE-2026-12228 – Stored XSS in Direct Messages via Prompt Sharing in parisneo/lollms

CVE ID :CVE-2026-12228

Published : July 18, 2026, 9:17 p.m. | 23 minutes ago

Description :A stored cross-site scripting (XSS) vulnerability exists in the `POST /api/prompts/share` endpoint of parisneo/lollms (latest version). The endpoint stores attacker-controlled `prompt_content` into `DBDirectMessage.content` without server-side sanitization. When a victim opens the direct message (DM) thread, the message is rendered by the DM UI through `MessageContentRenderer`, which uses `v-html` to insert rendered HTML into the DOM. The frontend sanitizer, which is regex-based, fails to comprehensively sanitize attacker-controlled HTML, allowing malicious payloads to execute in the victim’s browser context. This vulnerability enables any authenticated user to send a malicious prompt-share message to another user’s inbox, leading to arbitrary JavaScript execution, authenticated actions as the victim, exposure of same-origin application data, and potential account takeover.

Severity: 8.7 | HIGH

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