{"id":"CVE-2026-11854","state":"PUBLISHED","title":"Cross-Site Scripting via Authentication Endpoint Error Message in Multiple WSO2 Products","description":"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.\n\nSuccessful 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.","publishedAt":"2026-10-28T19:21:33.216Z","updatedAt":"2026-10-29T02:02:14.279Z","severity":{"score":6.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","source":"WSO2"},"assigner":"WSO2","products":["WSO2 WSO2 API Manager","WSO2 WSO2 API Control Plane","WSO2 WSO2 Identity Server"],"affected":[{"vendor":"WSO2","product":"WSO2 API Manager","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"3.2.0","versionType":"custom"},{"version":"3.2.0","status":"affected","lessThan":"3.2.0.480","versionType":"custom"},{"version":"3.2.1","status":"affected","lessThan":"3.2.1.99","versionType":"custom"},{"version":"4.1.0","status":"affected","lessThan":"4.1.0.265","versionType":"custom"},{"version":"4.2.0","status":"affected","lessThan":"4.2.0.205","versionType":"custom"},{"version":"4.3.0","status":"affected","lessThan":"4.3.0.117","versionType":"custom"},{"version":"4.4.0","status":"affected","lessThan":"4.4.0.80","versionType":"custom"},{"version":"4.5.0","status":"affected","lessThan":"4.5.0.65","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.29","versionType":"custom"},{"version":"4.7.0","status":"affected","lessThan":"4.7.0.1","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 API Control Plane","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"4.5.0","versionType":"custom"},{"version":"4.5.0","status":"affected","lessThan":"4.5.0.66","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.30","versionType":"custom"},{"version":"4.7.0","status":"affected","lessThan":"4.7.0.1","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 Identity Server","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"5.10.0","versionType":"custom"},{"version":"5.10.0","status":"affected","lessThan":"5.10.0.399","versionType":"custom"},{"version":"5.11.0","status":"affected","lessThan":"5.11.0.446","versionType":"custom"},{"version":"6.0.0","status":"affected","lessThan":"6.0.0.272","versionType":"custom"},{"version":"6.1.0","status":"affected","lessThan":"6.1.0.274","versionType":"custom"},{"version":"7.0.0","status":"affected","lessThan":"7.0.0.155","versionType":"custom"},{"version":"7.1.0","status":"affected","lessThan":"7.1.0.65","versionType":"custom"},{"version":"7.2.0","status":"affected","lessThan":"7.2.0.26","versionType":"custom"}]}],"references":["https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4850/"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/11xxx/CVE-2026-11854.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11854","state":"PUBLISHED","datePublished":"2026-10-28T19:21:33.216Z","dateUpdated":"2026-10-29T02:02:14.279Z","assignerShortName":"WSO2","assignerOrgId":"ed10eef1-636d-4fbe-9993-6890dfa878f8","dateReserved":"2026-06-10T08:38:33.407Z"},"containers":{"cna":{"title":"Cross-Site Scripting via Authentication Endpoint Error Message in Multiple WSO2 Products","descriptions":[{"lang":"en","value":"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.\n\nSuccessful 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":[{"vendor":"WSO2","product":"WSO2 API Manager","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"3.2.0","versionType":"custom"},{"version":"3.2.0","status":"affected","lessThan":"3.2.0.480","versionType":"custom"},{"version":"3.2.1","status":"affected","lessThan":"3.2.1.99","versionType":"custom"},{"version":"4.1.0","status":"affected","lessThan":"4.1.0.265","versionType":"custom"},{"version":"4.2.0","status":"affected","lessThan":"4.2.0.205","versionType":"custom"},{"version":"4.3.0","status":"affected","lessThan":"4.3.0.117","versionType":"custom"},{"version":"4.4.0","status":"affected","lessThan":"4.4.0.80","versionType":"custom"},{"version":"4.5.0","status":"affected","lessThan":"4.5.0.65","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.29","versionType":"custom"},{"version":"4.7.0","status":"affected","lessThan":"4.7.0.1","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 API Control Plane","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"4.5.0","versionType":"custom"},{"version":"4.5.0","status":"affected","lessThan":"4.5.0.66","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.30","versionType":"custom"},{"version":"4.7.0","status":"affected","lessThan":"4.7.0.1","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 Identity Server","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"5.10.0","versionType":"custom"},{"version":"5.10.0","status":"affected","lessThan":"5.10.0.399","versionType":"custom"},{"version":"5.11.0","status":"affected","lessThan":"5.11.0.446","versionType":"custom"},{"version":"6.0.0","status":"affected","lessThan":"6.0.0.272","versionType":"custom"},{"version":"6.1.0","status":"affected","lessThan":"6.1.0.274","versionType":"custom"},{"version":"7.0.0","status":"affected","lessThan":"7.0.0.155","versionType":"custom"},{"version":"7.1.0","status":"affected","lessThan":"7.1.0.65","versionType":"custom"},{"version":"7.2.0","status":"affected","lessThan":"7.2.0.26","versionType":"custom"}]}],"references":[{"url":"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4850/","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":6.1,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"WSO2","orgId":"ed10eef1-636d-4fbe-9993-6890dfa878f8","dateUpdated":"2026-10-28T19:21:33.216Z"},"impacts":[{"capecId":"CAPEC-23","descriptions":[{"lang":"en","value":"CAPEC-23 CAPEC-23: Cross-site Scripting"}]}],"solutions":[{"lang":"en","value":"Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4850/#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/WSO2-2025-4850/#solution\"><span style=\"background-color: transparent;\">https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4850/#solution</span></a> <br>"}]}],"source":{"advisory":"WSO2-2025-4850","discovery":"INTERNAL"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-11854","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-29T01:51:55.296399Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-29T02:02:14.279Z"}}]}}}