CVE-2025-10503

Reflected Cross-Site Scripting via Authentication Endpoint in WSO2 Identity Server

Published Apr 29, 2026 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4577/#solution

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Wso2 identity Server
CPEs cpe:2.3:a:wso2:identity_server:*:*:*:*:*:*:*:*
Vendors & Products Wso2 identity Server
Type Values Removed Values Added
Description 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.
Title Reflected Cross-Site Scripting via Authentication Endpoint in WSO2 Identity Server
First Time appeared Wso2
Wso2 wso2 Identity Server
Weaknesses CWE-79
CPEs cpe:2.3:a:wso2:wso2_identity_server:*:*:*:*:*:*:*:*
Vendors & Products Wso2
Wso2 wso2 Identity Server
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WSO2
Published
Updated
Apr 29, 2026, 12:28 PM
Reserved
Sep 16, 2025, 4:58 AM
Status
Analyzed
Published
Apr 29, 2026, 9:16 AM
Modified
Oct 7, 2026, 9:10 AM