CVE-2026-27169 HIGH

CVE-2026-27169: OpenSift: Persistent XSS Chat Tool Rendering

Vendor Opensift
Product OpenSift
Weakness CWE-79 · XSS
Published February 20, 2026
Last update February 25, 2026

CVSS base score

8.9/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

What the vulnerability does

01Description

OpenSift is an AI study tool that sifts through large datasets using semantic search and generative AI. Versions 1.1.2-alpha and below render untrusted user/model content in chat tool UI surfaces using unsafe HTML interpolation patterns, leading to XSS. Stored content can execute JavaScript when later viewed in authenticated sessions. An attacker who can influence stored study/quiz/flashcard content could trigger script execution in a victim’s browser, potentially performing actions as that user in the local app session. This issue has been fixed in version 1.1.3-alpha.

Key dates

02Disclosure timeline

February 20, 2026 CVE published
February 25, 2026 Record updated