{"id":"CVE-2020-27846","aliases":["BIT-grafana-2020-27846","EUVD-2021-1260","GHSA-4hq8-gmxx-h6w9","GO-2021-0058","OESA-2021-1445","RHSA-2021:1859","RLSA-2021:1859"],"status":"published","title":"XML Processing error in github.com/crewjam/saml","description":"A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.04931,"percentile":0.92247,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-115","CWE-287"],"published":"2020-12-21T15:16:14Z","modified":"2026-10-24T10:51:23Z","fixes":[{"ecosystem":"Go","package":"github.com/crewjam/saml","fixed_in":["0.4.3"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"grafana","fixed_in":["6.7.5","7.2.3","7.3.6"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/crewjam/saml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.3"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"grafana","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.7.5"},{"introduced":"7.0.0"},{"fixed":"7.2.3"},{"introduced":"7.3.0"},{"fixed":"7.3.6"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/crewjam/saml","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.4.3"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/crewjam/saml","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.4.3"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP1","package":"grafana","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.5.11-1.oe1"}]}],"bundled":6},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP2","package":"grafana","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.5.11-1.oe1"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:8::appstream","package":"grafana","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:7.3.6-2.el8"}]}],"bundled":2},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:8::appstream","package":"grafana-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:7.3.6-2.el8"}]}],"bundled":2},{"source":"osv","ecosystem":"Rocky Linux:8","package":"grafana","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:7.3.6-2.el8"}]}],"bundled":2}],"products":[{"vendor":"fedoraproject","product":"fedora"},{"vendor":"grafana","product":"grafana"},{"vendor":"redhat","product":"enterprise_linux"},{"vendor":"redhat","product":"openshift_container_platform"},{"vendor":"redhat","product":"openshift_service_mesh"},{"vendor":"saml_project","product":"saml"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1907670","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","advisory","fix","web","report"]},{"url":"https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","advisory","evidence","article"]},{"url":"https://github.com/crewjam/saml/security/advisories/GHSA-4hq8-gmxx-h6w9","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web","article"]},{"url":"https://grafana.com/blog/2020/12/17/grafana-6.7.5-7.2.3-and-7.3.6-released-with-important-security-fix-for-grafana-enterprise/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory","article"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YUTKIRWT6TWU7DS6GF3EOANVQBFQZYI/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ICP3YRY2VUCNCF2VFUSK77ZMRIC77FEM/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://security.netapp.com/advisory/ntap-20210205-0002/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27846","tags":["web","advisory"]},{"url":"https://github.com/crewjam/saml/commit/da4f1a0612c0a8dd0452cf8b3c7a6518f6b4d053","tags":["web","fix"]},{"url":"https://pkg.go.dev/vuln/GO-2021-0058","tags":["web"]},{"url":"https://grafana.com/blog/2020/12/17/grafana-6.7.5-7.2.3-and-7.3.6-released-with-important-security-fix-for-grafana-enterprise","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3YUTKIRWT6TWU7DS6GF3EOANVQBFQZYI","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ICP3YRY2VUCNCF2VFUSK77ZMRIC77FEM","tags":["web"]},{"url":"https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities","tags":["web"]},{"url":"https://security.netapp.com/advisory/ntap-20210205-0002","tags":["web"]},{"url":"https://github.com/advisories/GHSA-4hq8-gmxx-h6w9"},{"url":"https://github.com/crewjam/saml","tags":["package"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1445","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-24303","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27358","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-28148","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-28147","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39226","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:1859","tags":["advisory"]},{"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/8.4_release_notes/","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1843170","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1850471","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1892418","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1916083","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_1859.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2020-24303","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-24303","tags":["advisory"]},{"url":"https://github.com/grafana/grafana/pull/25401","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2020-27846","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-27846","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2021:1859","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2020-27846","description":"A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.","status":"published","published":"2020-12-21T15:16:14Z","modified":"2024-08-04T16:25:43.248Z","cwes":["CWE-115"],"updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2021-1260","description":"A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.","status":"published","published":"2020-12-21T15:16:14Z","modified":"2024-08-04T16:25:43Z","updated_at":"2026-11-03T03:07:11.320494Z"}],"ghsa":[{"id":"GHSA-4hq8-gmxx-h6w9","title":"XML Processing error in github.com/crewjam/saml","description":"### Impact\n\nThere are three vulnerabilities in the go `encoding/xml` package that can allow an attacker to forge part of a signed XML document. For details on this vulnerability see [xml-roundtrip-validator](https://github.com/mattermost/xml-roundtrip-validator)\n\n### Patches\n\nIn version 0.4.3, all XML input is validated prior to being parsed.","status":"published","published":"2021-06-23T17:29:42Z","modified":"2025-09-19T17:41:51Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-115","CWE-287"],"updated_at":"2026-11-02T14:38:58.107905Z"}],"nvd":[{"id":"CVE-2020-27846","description":"A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.","status":"published","published":"2020-12-21T16:15:13.067Z","modified":"2026-06-17T03:09:43.88Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-115"],"updated_at":"2026-11-02T14:06:27.73474Z"}],"osv":[{"id":"CVE-2020-27846","description":"A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.","status":"published","published":"2020-12-21T16:15:13.067Z","modified":"2026-10-24T10:51:23.1701961Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"GHSA-4hq8-gmxx-h6w9","title":"XML Processing error in github.com/crewjam/saml","description":"### Impact\n\nThere are three vulnerabilities in the go `encoding/xml` package that can allow an attacker to forge part of a signed XML document. For details on this vulnerability see [xml-roundtrip-validator](https://github.com/mattermost/xml-roundtrip-validator)\n\n### Patches\n\nIn version 0.4.3, all XML input is validated prior to being parsed.","status":"published","published":"2021-06-23T17:29:42Z","modified":"2026-09-10T03:49:15.079722633Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-115","CWE-287"],"updated_at":"2026-11-02T15:46:37.148947Z"},{"id":"OESA-2021-1445","title":"grafana security update","description":"Grafana is an open source, feature rich metrics dashboard and graph editor for Graphite, InfluxDB \u0026amp; OpenTSDB.\r\n\r\nSecurity Fix(es):\r\n\r\nGrafana before 7.1.0-beta 1 allows XSS via a query alias for the ElasticSearch datasource.(CVE-2020-24303)\r\n\r\nA signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.(CVE-2020-27846)\r\n\r\nThe snapshot feature in Grafana 6.7.3 through 7.4.1 can allow an unauthenticated remote attackers to trigger a Denial of Service via a remote API call if a commonly used configuration is set.(CVE-2021-27358)\r\n\r\nOne of the usage insights HTTP API endpoints in Grafana Enterprise 6.x before 6.7.6, 7.x before 7.3.10, and 7.4.x before 7.4.5 is accessible without any authentication. This allows any unauthenticated user to send an unlimited number of requests to the endpoint, leading to a denial of service (DoS) attack against a Grafana Enterprise instance.(CVE-2021-28148)\r\n\r\nThe team sync HTTP API in Grafana Enterprise 6.x before 6.7.6, 7.x before 7.3.10, and 7.4.x before 7.4.5 has an Incorrect Access Control issue. On Grafana instances using an external authentication service and having the EditorsCanAdmin feature enabled, this vulnerability allows any authenticated user to add external groups to any existing team. This can be used to grant a user team permissions that the user isn\u0026apos;t supposed to have.(CVE-2021-28147)\r\n\r\nGrafana is an open source data visualization platform. In affected versions unauthenticated and authenticated users are able to view the snapshot with the lowest database key by accessing the literal paths: /dashboard/snapshot/:key, or /api/snapshots/:key. If the snapshot \u0026quot;public_mode\u0026quot; configuration setting is set to True (vs default of False), unauthenticated users are able to delete the snapshot with the lowest database key by accessing the literal path: /api/snapshots-delete/:deleteKey. Regardless of the snapshot \u0026quot;public_mode\u0026quot; setting, authenticated users are able to delete the snapshot with the lowest database key by accessing the literal paths: /api/snapshots/:key, or /api/snapshots-delete/:deleteKey. The combination of deletion and viewing enables a complete walk through all snapshot data while resulting in complete snapshot data loss. This issue has been resolved in versions 8.1.6 and 7.5.11. If for some reason you cannot upgrade you can use a reverse proxy or similar to block access to the literal paths: /api/snapshots/:key, /api/snapshots-delete/:deleteKey, /dashboard/snapshot/:key, and /api/snapshots/:key. They have no normal function and can be disabled without side effects.(CVE-2021-39226)","status":"published","published":"2021-11-26T11:04:43Z","modified":"2026-08-18T01:16:12.533143455Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2021:1859","title":"Red Hat Security Advisory: grafana security, bug fix, and enhancement update","status":"published","published":"2024-09-18T04:18:09Z","modified":"2026-03-27T10:16:44.688667Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:08.071325Z"},{"id":"RLSA-2021:1859","title":"Moderate: grafana security, bug fix, and enhancement update","description":"Grafana is an open source, feature rich metrics dashboard and graph editor for Graphite, InfluxDB \u0026 OpenTSDB. \n\nThe following packages have been upgraded to a later upstream version: grafana (7.3.6). (BZ#1850471)\n\nSecurity Fix(es):\n\n* crewjam/saml: authentication bypass in saml authentication (CVE-2020-27846)\n\n* grafana: XSS via a query alias for the Elasticsearch and Testdata datasource (CVE-2020-24303)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Rocky Linux 8.4 Release Notes linked from the References section.","status":"published","published":"2021-05-18T06:16:06Z","modified":"2026-02-05T02:00:11.142563Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:23.969672Z"},{"id":"BIT-grafana-2020-27846","description":"A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.","status":"published","published":"2024-03-06T11:00:29.021Z","modified":"2026-09-08T08:47:50.65058472Z","updated_at":"2026-11-02T15:28:31.02759Z"},{"id":"GO-2021-0058","title":"Signature validation bypass due to XML processing error in github.com/crewjam/saml","description":"Due to the behavior of encoding/xml, a crafted XML document may cause XML Digital Signature validation to be entirely bypassed, causing an unsigned document to appear signed.","status":"published","published":"2021-04-14T20:04:52Z","modified":"2024-05-20T16:03:47Z","updated_at":"2026-11-02T15:47:00.604718Z"}]}}