CVE Vulnerabilities


Improper Neutralization of Alternate XSS Syntax

Published: Feb 19, 2024 | Modified: Feb 19, 2024
CVSS 3.x
CVSS 2.x

Iris is a web collaborative platform that helps incident responders share technical details during investigations. A stored Cross-Site Scripting (XSS) vulnerability has been identified in iris-web, affecting multiple locations in versions prior to v2.4.0. The vulnerability may allow an attacker to inject malicious scripts into the application, which could then be executed when a user visits the affected locations. This could lead to unauthorized access, data theft, or other related malicious activities. An attacker need to be authenticated on the application to exploit this vulnerability. The issue is fixed in version v2.4.0 of iris-web. No workarounds are available.


The product does not neutralize or incorrectly neutralizes user-controlled input for alternate script syntax.

Potential Mitigations

  • Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.
  • The problem of inconsistent output encodings often arises in web pages. If an encoding is not specified in an HTTP header, web browsers often guess about which encoding is being used. This can open up the browser to subtle XSS attacks.