{"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": "2026-08-21T20:40:08.199Z"}, "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"}}}}

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