---
id: CVE-2025-10503
title: >-
  The authentication endpoint accepts user-supplied input without enforcing
  expected validation constraints, leading to a lack of proper output encoding
summary: >-
  The authentication endpoint accepts user-supplied input without enforcing
  expected validation constraints, leading to a lack of proper output encoding.
  This allows for the injection of malicious JavaScript payloads, enabling
  reflected cr…
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'
cwe:
  - CWE-79
vendor: wso2
product: identity_server
affected:
  - 'identity_server >= 7.1.0, < 7.1.0.28'
patched:
  - identity_server 7.1.0.28
published: '2026-04-29'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T22:10:00.273'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-10503'
references:
  - url: >-
      https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4577/
    label: ed10eef1-636d-4fbe-9993-6890dfa878f8
tags:
  - nvd
epss: 0.00173
epssPercentile: 0.06044
ingestedAt: '2026-09-30T22:27:27.772Z'
---

## Overview

The authentication endpoint accepts user-supplied input without enforcing expected validation constraints, leading to a lack of proper output encoding. This allows for the injection of malicious JavaScript payloads, enabling reflected cross-site scripting.

An attacker can leverage this vulnerability to redirect the user's browser to a malicious website, modify the user interface of the web page, retrieve information from the browser, or cause other harmful actions. However, due to the protection of session-related cookies with the httpOnly flag, session hijacking is not possible.

## Affected

- `identity_server >= 7.1.0, < 7.1.0.28`

## Remediation

Upgrade past the affected range:

- `identity_server 7.1.0.28`