CVE-2026-27169CWE-116CWE-79

OpenSift: Persistent XSS Chat Tool Rendering

High · published February 20, 2026

CVSS v3.1
8.9
EPSS
1%
Percentile
44.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.9 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00541 · 44.7th percentile
Weaknesses
CWE-116 · Improper Encoding or Escaping of Output; CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-02-20T23:51Z
EPSS history
Timeline
  • 20 FEB 23:51Z
    OpenSift: Persistent XSS Chat Tool Rendering
    cvelistv5