{"id":"CVE-2026-63135","summary":"YOURLS: Stored XSS in referrer statistics chart via crafted Referer header","details":"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.","aliases":["GHSA-5h77-88j3-r659"],"modified":"2026-09-11T03:30:50.549450999Z","published":"2026-08-21T20:40:08.199Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63135.json"},"references":[{"type":"WEB","url":"https://github.com/YOURLS/YOURLS/releases/tag/1.10.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63135.json"},{"type":"ADVISORY","url":"https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63135"},{"type":"FIX","url":"https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7"},{"type":"FIX","url":"https://github.com/YOURLS/YOURLS/pull/4107"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/yourls/yourls","events":[{"introduced":"c153cc47febfad72f20d4ab1f344f7d029aa0ffc"},{"fixed":"e1e93476655107e6caab34e52259eb1c91079ec7"},{"fixed":"ef695ea14d89d920e771a88f32cbe0485256366a"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"1.5.1"},{"fixed":"1.10.4"}]}}],"versions":["1.10.3","1.10.2","1.10.1","1.10.0","1.9.2","1.9.1","1.9","1.8.2","1.8.1","1.8","1.7.9","1.7.6","1.7.5","1.7.4","1.7.3","1.7.1","1.7.2","1.7","1.6","1.5.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63135.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N"}]}