{"id":"CVE-2019-3877","aliases":["DEBIAN-CVE-2019-3877","DSA-4414-1","EUVD-2019-13488","GHSA-qr9h-f4fq-2h85","RHSA-2019:0766","RHSA-2019:3421","UBUNTU-CVE-2019-3877","USN-3924-1","USN-4597-1"],"status":"published","title":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL...","description":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.","severity":{"version":"3.0","score":5.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.02121,"percentile":0.82001,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2019-03-22T00:00:00Z","modified":"2026-10-20T13:41:50Z","fixes":[{"ecosystem":"Debian:12","package":"libapache2-mod-auth-mellon","fixed_in":["0.14.2-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"libapache2-mod-auth-mellon","fixed_in":["0.14.2-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"libapache2-mod-auth-mellon","fixed_in":["0.14.2-1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","package":"mod_auth_mellon","fixed_in":["0:0.14.0-9.el8"],"sources":["osv"]},{"ecosystem":"Red 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Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/Uninett/mod_auth_mellon/issues/35","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/Uninett/mod_auth_mellon/commit/62041428a32de402e0be6ba45fe12df6a83bedb8","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://usn.ubuntu.com/3924-1/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CNW5YMC5TLWVWNJEY6AIWNSNPRAMWPQJ/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X7NLAU7KROWNTHAYSA2S67X347F42L2I/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://access.redhat.com/errata/RHSA-2019:0766","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2019:3421","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-3877","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CNW5YMC5TLWVWNJEY6AIWNSNPRAMWPQJ/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X7NLAU7KROWNTHAYSA2S67X347F42L2I/"},{"url":"https://github.com/advisories/GHSA-qr9h-f4fq-2h85"},{"url":"https://security-tracker.debian.org/tracker/CVE-2019-3877","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1691125","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1691126","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1697487","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2019/rhsa-2019_0766.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2019-3877","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-3877","tags":["advisory","report"]},{"url":"https://access.redhat.com/security/cve/CVE-2019-3878","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-3878","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-3878","tags":["advisory"]},{"url":"https://github.com/Uninett/mod_auth_mellon/pull/196","tags":["article"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.1_release_notes/","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1691894","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1702695","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2019/rhsa-2019_3421.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2019-3877","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-3924-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-4597-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2019-3878","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2017-6807","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2019-3877","description":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.","status":"published","published":"2019-03-27T12:19:19Z","modified":"2024-08-04T19:19:18.685Z","cvss":[{"version":"3.0","score":5.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:20:23.048861Z"}],"euvd":[{"id":"EUVD-2019-13488","description":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.","status":"published","published":"2019-03-27T12:19:19Z","modified":"2024-08-04T19:19:18Z","cvss":[{"version":"3.0","score":5.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:06:54.939848Z"}],"ghsa":[{"id":"GHSA-qr9h-f4fq-2h85","title":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL...","description":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.","status":"published","published":"2022-05-14T01:09:51Z","modified":"2023-02-02T05:03:11Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:51:35.055103Z"}],"nvd":[{"id":"CVE-2019-3877","description":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.","status":"published","published":"2019-03-27T13:29:01.82Z","modified":"2026-06-17T02:35:47.273Z","cvss":[{"version":"3.0","score":5.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:05:09.523883Z"}],"osv":[{"id":"CVE-2019-3877","description":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.","status":"published","published":"2019-03-27T13:29:01.82Z","modified":"2026-10-20T13:41:50.703421963Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:12.363788Z"},{"id":"DEBIAN-CVE-2019-3877","description":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.","status":"published","published":"2019-03-27T13:29:01.82Z","modified":"2026-09-21T07:03:19.36773748Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:32.221385Z"},{"id":"RHSA-2019:0766","title":"Red Hat Security Advisory: mod_auth_mellon security and bug fix update","status":"published","published":"2024-09-16T02:23:11Z","modified":"2026-06-29T10:24:07Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:05.383061Z"},{"id":"RHSA-2019:3421","title":"Red Hat Security Advisory: mod_auth_mellon security, bug fix, and enhancement update","status":"published","published":"2024-09-16T02:23:17Z","modified":"2025-11-22T11:50:19Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:06.0195Z"},{"id":"UBUNTU-CVE-2019-3877","description":"A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.","status":"published","published":"2019-03-22T00:00:00Z","modified":"2026-02-04T02:52:57.416793Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"},{"version":"3.0","score":5.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:21.213407Z"},{"id":"DSA-4414-1","title":"libapache2-mod-auth-mellon - security update","status":"published","published":"2019-03-23T00:00:00Z","modified":"2026-03-09T02:09:13.443675Z","updated_at":"2026-11-02T15:46:16.862196Z"},{"id":"USN-3924-1","title":"libapache2-mod-auth-mellon vulnerabilities","description":"It was discovered that mod_auth_mellon incorrectly handled certain requests.\nAn attacker could possibly use this issue to redirect a user to a malicious\nURL. (CVE-2019-3877)\n\nIt was discovered that mod_auth_mellon incorrectly handled certain requests.\nAn attacker could possibly use this issue to access sensitive information.\n(CVE-2019-3878)\n","status":"published","published":"2019-03-28T13:24:30Z","modified":"2026-02-10T04:41:29Z","updated_at":"2026-11-02T16:58:14.019824Z"},{"id":"USN-4597-1","title":"libapache2-mod-auth-mellon vulnerabilities","description":"François Kooman discovered that mod_auth_mellon incorrectly handled\ncookies. An attacker could possibly use this issue to cause a Cross-Site\nSession Transfer attack. (CVE-2017-6807)\n\nIt was discovered that mod_auth_mellon incorrectly handled certain requests.\nAn attacker could possibly use this issue to redirect a user to a malicious\nURL. (CVE-2019-3877)\n\nIt was discovered that mod_auth_mellon incorrectly handled certain requests.\nAn attacker could possibly use this issue to access sensitive information.\n(CVE-2019-3878)\n","status":"published","published":"2020-10-22T12:47:17Z","modified":"2026-02-10T04:41:58Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}