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.
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-10503",
"assignerOrgId": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"assignerShortName": "WSO2",
"dateUpdated": "2026-04-29T08:08:37.335Z",
"dateReserved": "2025-09-16T04:58:57.289Z",
"datePublished": "2026-04-29T08:08:37.335Z",
"state": "PUBLISHED"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"shortName": "WSO2",
"dateUpdated": "2026-04-29T08:08:37.335Z"
},
"title": "Reflected Cross-Site Scripting via Authentication Endpoint in WSO2 Identity Server",
"descriptions": [
{
"lang": "en",
"value": "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.\n\nAn 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.",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "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.\n\nAn 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": [
{
"vendor": "WSO2",
"product": "WSO2 Identity Server",
"defaultStatus": "unaffected",
"versions": [
{
"version": "7.1.0",
"status": "affected",
"versionType": "custom",
"lessThan": "7.1.0.28"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
"cweId": "CWE-79",
"type": "CWE"
}
]
}
],
"references": [
{
"url": "https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4577/",
"tags": [
"vendor-advisory"
]
}
],
"impacts": [
{
"capecId": "CAPEC-20",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-20 CAPEC-20: Cross-site Scripting"
}
]
}
],
"metrics": [
{
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
],
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "CHANGED",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM"
}
}
],
"solutions": [
{
"lang": "en",
"value": "Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4577/#solution",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "<span style=\"background-color: transparent;\">Follow the instructions given on </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4577/#solution\"><span style=\"background-color: transparent;\">https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4577/#solution</span></a> <br>"
}
]
}
]
}
}
}