parisneo lollms MessageContentRenderer /api/prompts/share prompt_content cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in parisneo lollms. This vulnerability affects unknown code of the file /api/prompts/share of the component MessageContentRenderer. Performing a manipulation of the argument prompt_content results in cross site scripting. This vulnerability is reported as CVE-2026-12228. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic has been found in parisneo lollms (the affected version is unknown). This affects an unknown code of the file /api/prompts/share of the component MessageContentRenderer. The manipulation of the argument prompt_content with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

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.

The advisory is shared at huntr.com. This vulnerability is uniquely identified as CVE-2026-12228 since 06/14/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-45401). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• parisneo

Name

• lollms

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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