{"id":"CVE-2026-28413","aliases":["EUVD-2026-9872","GHSA-43gx-6gv6-3jcp","PYSEC-2026-112"],"status":"published","title":"Products.isurlinportal: Possible open redirect when using more than 2 forward slashes","description":"Products.isurlinportal is a replacement for isURLInPortal method in Plone. Prior to versions 2.1.0, 3.1.0, and 4.0.0, a url /login?came_from=////evil.example may redirect to an external website after login. This issue has been patched in versions 2.1.0, 3.1.0, and 4.0.0.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00257,"percentile":0.17541,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2026-03-02T20:14:23Z","modified":"2026-10-28T02:30:46Z","fixes":[{"ecosystem":"PyPI","package":"products-isurlinportal","fixed_in":["4.0.0","3.1.0","2.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0a1"},{"last_affected":"4.0.0a1"},{"fixed":"4.0.0"}]}],"versions":["4.0.0a1"]},{"source":"ghsa","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.1.0"}]}]},{"source":"ghsa","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0"}]}]},{"source":"ghsa","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0"}]}]},{"source":"ghsa","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.1.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0a1"},{"fixed":"4.0.0"}]}],"versions":["4.0.0a1"]},{"source":"osv","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.1.0"}]}],"versions":["3.0.0","3.0.1"]},{"source":"osv","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0"}]}],"versions":["1.0.0","1.1.0","1.1.1","1.2.0","1.2.1","2.0.0","2.0.1","2.0.2","2.0.3"]},{"source":"osv","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0"}]}],"versions":["1.0.0","1.1.0","1.1.1","1.2.0","1.2.1","2.0.0","2.0.1","2.0.2","2.0.3"]},{"source":"osv","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.1.0"}]}],"versions":["3.0.0","3.0.1"]},{"source":"osv","ecosystem":"PyPI","package":"products-isurlinportal","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0"},{"introduced":"3.0.0"},{"fixed":"3.1.0"}]}],"versions":["1.0.0","1.1.0","1.1.1","1.2.0","1.2.1","2.0.0","2.0.1","2.0.2","2.0.3","3.0.0","3.0.1"]}],"products":[{"vendor":"plone","product":"isurlinportal"},{"vendor":"plone","product":"products.isurlinportal"}],"references":[{"url":"https://github.com/plone/Products.isurlinportal/security/advisories/GHSA-43gx-6gv6-3jcp","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28413","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/products-isurlinportal/PYSEC-2026-112.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-43gx-6gv6-3jcp"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28413.json","tags":["advisory"]},{"url":"https://github.com/plone/Products.isurlinportal","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-28413","title":"Products.isurlinportal: Possible open redirect when using more than 2 forward slashes","description":"Products.isurlinportal is a replacement for isURLInPortal method in Plone. Prior to versions 2.1.0, 3.1.0, and 4.0.0, a url /login?came_from=////evil.example may redirect to an external website after login. This issue has been patched in versions 2.1.0, 3.1.0, and 4.0.0.","status":"published","published":"2026-03-05T20:16:10.098Z","modified":"2026-03-06T17:03:20.625Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:20:01.969981Z"}],"euvd":[{"id":"EUVD-2026-9872","description":"Products.isurlinportal is a replacement for isURLInPortal method in Plone. Prior to versions 2.1.0, 3.1.0, and 4.0.0, a url /login?came_from=////evil.example may redirect to an external website after login. This issue has been patched in versions 2.1.0, 3.1.0, and 4.0.0.","status":"published","published":"2026-03-05T20:16:10Z","modified":"2026-03-06T17:03:20Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T19:48:07.686491Z"}],"ghsa":[{"id":"GHSA-43gx-6gv6-3jcp","title":"Products.isurlinportal has possible open redirect when using more than 2 forward slashes","description":"### Impact\nA url `/login?came_from=////evil.example` may redirect to an external website after login.\n\nStandard Plone is not affected, but if you have customised the login, for example with add-ons, you might be affected. You can try the url to check if you are affected or not.\n\n### Patches\nThe problem has been patched in `Products.isurlinportal`.\n\n* Plone 6.2: upgrade to `Products.isurlinportal` 4.0.0.\n* Plone 6.1: upgrade to `Products.isurlinportal` 3.1.0.\n* Plone 6.0: upgrade to `Products.isurlinportal` 2.1.0.\n* Older Plone versions don't have security support anymore.\n\n### Workarounds\nThere are no known workarounds.\n\n### Background\nWhen you are anonymous and land on a page that requires a login, Plone sends you to the login form. After successful login, Plone redirects you back to the page you came from.  Various other forms and pages have a similar system.\n\nThis could get abused by an attacker to trick Plone into redirecting to a different website. Plone checks the page that would be redirected to. It is only accepted if it is within the Plone site domain or part of a different trusted domain.\n\nThe main check for this is in the `Products.isurlinportal` package. A lot of potentially malicious urls are already safely rejected, but here a loop hole was found.\n\nThis was discovered during a penetration test by the CERT-EU Team.","status":"published","published":"2026-03-02T20:14:23Z","modified":"2026-06-08T18:34:34Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:40:18.682012Z"}],"nvd":[{"id":"CVE-2026-28413","description":"Products.isurlinportal is a replacement for isURLInPortal method in Plone. Prior to versions 2.1.0, 3.1.0, and 4.0.0, a url /login?came_from=////evil.example may redirect to an external website after login. This issue has been patched in versions 2.1.0, 3.1.0, and 4.0.0.","status":"published","published":"2026-03-05T21:16:22.023Z","modified":"2026-06-17T10:28:34.623Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:12:07.852448Z"}],"osv":[{"id":"CVE-2026-28413","title":"Products.isurlinportal: Possible open redirect when using more than 2 forward slashes","description":"Products.isurlinportal is a replacement for isURLInPortal method in Plone. Prior to versions 2.1.0, 3.1.0, and 4.0.0, a url /login?came_from=////evil.example may redirect to an external website after login. This issue has been patched in versions 2.1.0, 3.1.0, and 4.0.0.","status":"published","published":"2026-03-05T20:16:10.098Z","modified":"2026-10-28T02:30:46.001171079Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:45:00.180685Z"},{"id":"GHSA-43gx-6gv6-3jcp","title":"Products.isurlinportal has possible open redirect when using more than 2 forward slashes","description":"### Impact\nA url `/login?came_from=////evil.example` may redirect to an external website after login.\n\nStandard Plone is not affected, but if you have customised the login, for example with add-ons, you might be affected. You can try the url to check if you are affected or not.\n\n### Patches\nThe problem has been patched in `Products.isurlinportal`.\n\n* Plone 6.2: upgrade to `Products.isurlinportal` 4.0.0.\n* Plone 6.1: upgrade to `Products.isurlinportal` 3.1.0.\n* Plone 6.0: upgrade to `Products.isurlinportal` 2.1.0.\n* Older Plone versions don't have security support anymore.\n\n### Workarounds\nThere are no known workarounds.\n\n### Background\nWhen you are anonymous and land on a page that requires a login, Plone sends you to the login form. After successful login, Plone redirects you back to the page you came from.  Various other forms and pages have a similar system.\n\nThis could get abused by an attacker to trick Plone into redirecting to a different website. Plone checks the page that would be redirected to. It is only accepted if it is within the Plone site domain or part of a different trusted domain.\n\nThe main check for this is in the `Products.isurlinportal` package. A lot of potentially malicious urls are already safely rejected, but here a loop hole was found.\n\nThis was discovered during a penetration test by the CERT-EU Team.","status":"published","published":"2026-03-02T20:14:23Z","modified":"2026-06-08T18:45:17.829069103Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:36.434231Z"},{"id":"PYSEC-2026-112","description":"Products.isurlinportal is a replacement for isURLInPortal method in Plone. Prior to versions 2.1.0, 3.1.0, and 4.0.0, a url /login?came_from=////evil.example may redirect to an external website after login. This issue has been patched in versions 2.1.0, 3.1.0, and 4.0.0.","status":"published","published":"2026-03-05T21:16:22.023Z","modified":"2026-05-20T09:19:11.857191Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:54.622769Z"}]}}