{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63135",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-07-15T16:54:55.817Z",
        "datePublished": "2026-08-21T20:40:08.199Z",
        "dateUpdated": "2026-08-26T17:40:42.981Z"
    },
    "containers": {
        "cna": {
            "title": "YOURLS: Stored XSS in referrer statistics chart via crafted Referer header",
            "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": 8.2,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "scope": "CHANGED",
                        "userInteraction": "REQUIRED",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659"
                },
                {
                    "name": "https://github.com/YOURLS/YOURLS/pull/4107",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/YOURLS/YOURLS/pull/4107"
                },
                {
                    "name": "https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7"
                },
                {
                    "name": "https://github.com/YOURLS/YOURLS/releases/tag/1.10.4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/YOURLS/YOURLS/releases/tag/1.10.4"
                }
            ],
            "affected": [
                {
                    "vendor": "YOURLS",
                    "product": "YOURLS",
                    "versions": [
                        {
                            "version": ">= 1.5.1, < 1.10.4",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-21T20:40:08.199Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "YOURLS is a self-hosted, customizable URL shortener written in PHP. From 1.5.1 until 1.10.4, YOURLS stores the HTTP Referer header through yourls_get_referrer(), yourls_sanitize_url_safe(), and yourls_log_redirect(), then aggregates the value in yourls-infos.php and passes the derived domain through yourls_get_domain(), yourls_stats_pie(), and yourls_google_array_to_data_table(). The chart builder concatenates labels into inline JavaScript without JavaScript-string escaping, so an unauthenticated attacker can poison the statistics of an existing short URL with a crafted referrer. When an administrator or public stats-page viewer opens the affected statistics page, attacker-controlled JavaScript executes in the YOURLS origin and can access admin-visible data, the API signature token, and privileged same-origin actions. This issue is fixed in version 1.10.4."
                }
            ],
            "source": {
                "advisory": "GHSA-5h77-88j3-r659",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-26T17:40:19.146156Z",
                                "id": "CVE-2026-63135",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-26T17:40:42.981Z"
                }
            }
        ]
    }
}