---
id: CVE-2026-11854
title: >-
  Cross-Site Scripting via Authentication Endpoint Error Message in Multiple
  WSO2 Products
summary: >-
  The authentication endpoint generates an error message that includes reflected
  data directly from the request without sufficient sanitization or encoding.
  This allows an attacker to inject malicious scripts that can be executed in
  the co…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: WSO2
product: WSO2 API Manager
affected:
  - api_manager >= 3.2.0 < 3.2.0.480
  - api_manager >= 3.2.1 < 3.2.1.99
  - api_manager >= 4.1.0 < 4.1.0.265
  - api_manager >= 4.2.0 < 4.2.0.205
  - api_manager >= 4.3.0 < 4.3.0.117
  - api_manager >= 4.4.0 < 4.4.0.80
  - api_manager >= 4.5.0 < 4.5.0.65
  - api_manager >= 4.6.0 < 4.6.0.29
  - api_manager >= 4.7.0 < 4.7.0.1
  - api_control_plane >= 4.5.0 < 4.5.0.66
  - api_control_plane >= 4.6.0 < 4.6.0.30
  - api_control_plane >= 4.7.0 < 4.7.0.1
  - identity_server >= 5.10.0 < 5.10.0.399
  - identity_server >= 5.11.0 < 5.11.0.446
  - identity_server >= 6.0.0 < 6.0.0.272
  - identity_server >= 6.1.0 < 6.1.0.274
  - identity_server >= 7.0.0 < 7.0.0.155
  - identity_server >= 7.1.0 < 7.1.0.65
  - identity_server >= 7.2.0 < 7.2.0.26
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-29T01:51:55.296399Z'
published: '2026-10-28'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T02:02:14.279Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-11854'
references:
  - url: >-
      https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4850/
tags:
  - cve.org
epss: 0.00213
epssPercentile: 0.11668
ingestedAt: '2026-10-31T01:14:13.037Z'
---

## Overview

The authentication endpoint generates an error message that includes reflected data directly from the request without sufficient sanitization or encoding. This allows an attacker to inject malicious scripts that can be executed in the context of a victim's browser.

Successful exploitation enables an attacker to perform actions within the user's browser, such as redirecting the user to a malicious website, modifying the web page's user interface, or retrieving information. However, due to the httpOnly flag on session-related cookies, session hijacking or similar attacks are not possible.

## Affected

- `api_manager >= 3.2.0 < 3.2.0.480`
- `api_manager >= 3.2.1 < 3.2.1.99`
- `api_manager >= 4.1.0 < 4.1.0.265`
- `api_manager >= 4.2.0 < 4.2.0.205`
- `api_manager >= 4.3.0 < 4.3.0.117`
- `api_manager >= 4.4.0 < 4.4.0.80`
- `api_manager >= 4.5.0 < 4.5.0.65`
- `api_manager >= 4.6.0 < 4.6.0.29`
- `api_manager >= 4.7.0 < 4.7.0.1`
- `api_control_plane >= 4.5.0 < 4.5.0.66`
- `api_control_plane >= 4.6.0 < 4.6.0.30`
- `api_control_plane >= 4.7.0 < 4.7.0.1`
- `identity_server >= 5.10.0 < 5.10.0.399`
- `identity_server >= 5.11.0 < 5.11.0.446`
- `identity_server >= 6.0.0 < 6.0.0.272`
- `identity_server >= 6.1.0 < 6.1.0.274`
- `identity_server >= 7.0.0 < 7.0.0.155`
- `identity_server >= 7.1.0 < 7.1.0.65`
- `identity_server >= 7.2.0 < 7.2.0.26`

## Remediation

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4850/#solution