{"id":"GHSA-hhpq-7wg4-36jm","aliases":["CVE-2026-55590"],"title":"CakePHP Authentication: Open redirect weakness via backslash bypass","description":"### Impact\nThe `getLoginRedirect()` method contains a weakness to backslash bypasses allowing redirect targets with attacker controlled hostnames.\n\n### Patches\n2.11.1, 3.3.6 and 4.1.1 contain a fix for this issue.\n\n### Workarounds\nIf you are unable to upgrade, you should consider adding application validation to the redirect query string parameter to mitigate this vulnerability.","severity":"medium","score":5.1,"published":"2026-06-17T18:52:09.000Z","modified":"2026-08-14T18:45:12.637Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"cakephp/authentication","ranges":[{"events":[{"introduced":"3.0.0"},{"fixed":"3.3.6"}],"type":"ECOSYSTEM"}],"versions":["3.0.0","3.0.1","3.0.2","3.0.3","3.1.0","3.1.1","3.2.0","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.3.0","3.3.1","3.3.2","3.3.3","3.3.4","3.3.5"],"fixed":["3.3.6"]},{"ecosystem":"Packagist","name":"cakephp/authentication","ranges":[{"events":[{"introduced":"4.0.0"},{"fixed":"4.1.1"}],"type":"ECOSYSTEM"}],"versions":["4.0.0","4.0.1","4.1.0"],"fixed":["4.1.1"]},{"ecosystem":"Packagist","name":"cakephp/authentication","ranges":[{"events":[{"introduced":"0"},{"fixed":"2.11.1"}],"type":"ECOSYSTEM"}],"versions":["1.0.0","1.0.0-alpha1","1.0.0-beta1","1.0.0-beta2","1.0.0-beta3","1.0.0-beta4","1.0.0-rc1","1.0.0-rc2","1.0.0-rc3","1.0.0-rc4","1.0.0-rc5","1.0.0-rc6","1.0.0-rc7","1.0.0-rc8","1.0.0-rc9","1.0.1","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.1.5","1.2.0","1.2.1","1.3.0","1.4.0","1.4.1","1.4.2","2.0.0","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","2.1.0","2.10.0","2.10.1","2.10.2","2.11.0","2.2.0","2.3.0","2.3.1","2.4.0","2.5.0","2.6.0","2.6.1","2.6.2","2.7.0","2.8.0","2.9.0"],"fixed":["2.11.1"]}],"references":["https://github.com/cakephp/authentication/security/advisories/GHSA-hhpq-7wg4-36jm","https://nvd.nist.gov/vuln/detail/CVE-2026-55590","https://github.com/cakephp/authentication/pull/795","https://github.com/cakephp/authentication/pull/796","https://github.com/cakephp/authentication/pull/799","https://github.com/cakephp/authentication/commit/1c1e29c7e8129cfbcae74558316ecd3ea50a8273","https://github.com/cakephp/authentication/commit/df28ea4e712f1e5bd0e42be4a3c5c750ca50764d","https://github.com/cakephp/authentication/commit/ee24bd48b9c3ef693dc9965de8f0cc8020a7052c","https://github.com/cakephp/authentication","https://github.com/cakephp/authentication/releases/tag/2.11.1","https://github.com/cakephp/authentication/releases/tag/3.3.6","https://github.com/cakephp/authentication/releases/tag/4.1.1"],"sources":[{"name":"OSV","id":"GHSA-hhpq-7wg4-36jm","modified":"2026-08-14T18:45:12.637567282Z","url":"https://osv.dev/vulnerability/GHSA-hhpq-7wg4-36jm"}],"assessments":[{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":5.1}]}