CVE-2026-12228: Stored XSS in Direct Messages via Prompt Sharing in parisneo/lollms
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 promptcontent 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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-12228?
CVE-2026-12228 has a high severity rating of 8.7.
How do I fix CVE-2026-12228?
To fix CVE-2026-12228, implement proper server-side input validation and sanitization for the `prompt_content` stored in the direct messages.
What systems are affected by CVE-2026-12228?
CVE-2026-12228 affects the parisneo/lollms software when using the `POST /api/prompts/share` endpoint.
What kind of vulnerability is CVE-2026-12228?
CVE-2026-12228 is a stored cross-site scripting (XSS) vulnerability.
How does CVE-2026-12228 impact users?
CVE-2026-12228 can lead to the execution of malicious scripts in the context of the user's browser when they open a compromised direct message.