{"id":"CVE-2026-63135","title":"YOURLS is a self-hosted, customizable URL shortener written in PHP","summary":"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 …","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N","cwe":["CWE-79"],"vendor":"yourls","product":"yourls/yourls","affected":["yourls/yourls >= 1.5.1, <= 1.10.3"],"patched":["yourls/yourls 1.10.4"],"published":"2026-08-21","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:06:39.057","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63135","references":[{"url":"https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7","label":"security-advisories@github.com"},{"url":"https://github.com/YOURLS/YOURLS/pull/4107","label":"security-advisories@github.com"},{"url":"https://github.com/YOURLS/YOURLS/releases/tag/1.10.4","label":"security-advisories@github.com"},{"url":"https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659","label":"security-advisories@github.com"},{"url":"https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-5h77-88j3-r659"}],"tags":["nvd","ghsa","composer"],"epss":0.00314,"epssPercentile":0.2458,"aliases":["GHSA-5h77-88j3-r659"],"ecosystem":"composer","ingestedAt":"2026-08-21T21:22:19.393Z","slug":"CVE-2026-63135","body":"## Overview\n\nYOURLS 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-63135)\n\nAffected packages:\n\n- `yourls/yourls >= 1.5.1, <= 1.10.3`\n\nPatched in:\n\n- `yourls/yourls 1.10.4`\n\nSource: https://github.com/advisories/GHSA-5h77-88j3-r659","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}