{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55549",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-16T23:01:04.075Z",
        "datePublished": "2026-08-28T17:15:52.840Z",
        "dateUpdated": "2026-08-28T17:15:52.840Z"
    },
    "containers": {
        "cna": {
            "title": "Yamcs: Reflected XSS in the URL of the Authorize Endpoint",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-79",
                            "lang": "en",
                            "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 6.5,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "REQUIRED",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/yamcs/yamcs/security/advisories/GHSA-rxpg-wjf8-qv9c",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/yamcs/yamcs/security/advisories/GHSA-rxpg-wjf8-qv9c"
                },
                {
                    "name": "https://github.com/yamcs/yamcs/commit/4d47d5cdcf5d92c2c5bbbc19feada422923332e3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/yamcs/yamcs/commit/4d47d5cdcf5d92c2c5bbbc19feada422923332e3"
                },
                {
                    "name": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.9.4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.9.4"
                }
            ],
            "affected": [
                {
                    "vendor": "yamcs",
                    "product": "yamcs",
                    "versions": [
                        {
                            "version": "< 5.9.4",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-28T17:15:52.840Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Yamcs is a mission control framework. Prior to 5.9.4, Yamcs reflects an attacker-controlled redirect_uri parameter from GET /auth/authorize into yamcs-core/src/main/resources/auth/templates/authorize.html without adequate HTML escaping by yamcs-core/src/main/java/org/yamcs/http/auth/AuthHandler.java and yamcs-core/src/main/java/org/yamcs/http/HandlerContext.java. A crafted authorization URL can execute JavaScript when opened by a Yamcs user. The script can access browser-held authentication material and transmit it to an attacker, enabling account compromise. This issue is fixed in version 5.9.4."
                }
            ],
            "source": {
                "advisory": "GHSA-rxpg-wjf8-qv9c",
                "discovery": "UNKNOWN"
            }
        }
    }
}