Stored XSS in Direct Messages via Prompt Sharing in parisneo/lollms

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Summary

CVECVE-2026-12228
StatePUBLISHED
Assigner@huntr_ai
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-18 21:17:03 UTC
Updated2026-07-20 16:16:54 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.0 8.7 HIGH from [email protected]

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

EPSS: 0.002610000 probability, percentile 0.176450000 (date 2026-07-20)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary8.7HIGHCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
3.0CNADECLARED8.7HIGHCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Parisneo Parisneo/lollms affected unspecified latest custom Not specified

References

ReferenceSourceLinkTags
huntr.com/bounties/25623635-5ceb-4062-8289-02089e6d97c1 134c704f-9b21-4f2e-91b3-4a467353bcc0 huntr.com
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