{"id":"CVE-2026-63135","state":"PUBLISHED","title":"YOURLS: Stored XSS in referrer statistics chart via crafted Referer header","description":"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.","publishedAt":"2026-08-21T20:40:08.199Z","updatedAt":"2026-08-26T17:40:42.981Z","severity":{"score":8.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["YOURLS YOURLS"],"affected":[{"vendor":"YOURLS","product":"YOURLS","versions":[{"version":">= 1.5.1, < 1.10.4","status":"affected"}]}],"references":["https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659","https://github.com/YOURLS/YOURLS/pull/4107","https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7","https://github.com/YOURLS/YOURLS/releases/tag/1.10.4"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63135.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63135","state":"PUBLISHED","datePublished":"2026-08-21T20:40:08.199Z","dateUpdated":"2026-08-26T17:40:42.981Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-15T16:54:55.817Z"},"containers":{"cna":{"title":"YOURLS: Stored XSS in referrer statistics chart via crafted Referer header","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."}],"affected":[{"vendor":"YOURLS","product":"YOURLS","versions":[{"version":">= 1.5.1, < 1.10.4","status":"affected"}]}],"references":[{"url":"https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659","name":"https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/YOURLS/YOURLS/pull/4107","name":"https://github.com/YOURLS/YOURLS/pull/4107","tags":["x_refsource_MISC"]},{"url":"https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7","name":"https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7","tags":["x_refsource_MISC"]},{"url":"https://github.com/YOURLS/YOURLS/releases/tag/1.10.4","name":"https://github.com/YOURLS/YOURLS/releases/tag/1.10.4","tags":["x_refsource_MISC"]}],"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"}}],"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":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-21T20:40:08.199Z"},"source":{"advisory":"GHSA-5h77-88j3-r659","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-26T17:40:42.981Z"}}]}}}