{"id":"GHSA-m5vr-3m74-jwxp","aliases":["BIT-typo3-2020-15098","CVE-2020-15098"],"title":"Missing Required Cryptographic Step Leading to Sensitive Information Disclosure in TYPO3 CMS","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"HIGH","description":"> ### Meta\n> * CVSS: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C` (8.2)\n> * CWE-325, CWE-20, CWE-200, CWE-502\n\n### Problem\nIt has been discovered that an internal verification mechanism can be used to generate arbitrary checksums. This allows to inject arbitrary data having a valid cryptographic message authentication code (HMAC-SHA1) and can lead to various attack chains as described below.\n\n* [TYPO3-CORE-SA-2020-007](https://typo3.org/security/advisory/typo3-core-sa-2020-007), [CVE-2020-15099](https://nvd.nist.gov/vuln/detail/CVE-2020-15099): Potential Privilege Escalation\n  + the database server used for a TYPO3 installation must be accessible for an attacker (either via internet or shared hosting network)\n  + `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C` (7.5, high)\n* [TYPO3-CORE-SA-2016-013](https://typo3.org/security/advisory/typo3-core-sa-2016-013), [CVE-2016-5091](https://nvd.nist.gov/vuln/detail/CVE-2016-5091): Insecure Deserialization & Remote Code Execution\n  + an attacker must have access to at least one Extbase plugin or module action in a TYPO3 installation\n  + `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C` (9.1, critical)\n\nThe overall severity of this vulnerability is **high (8.2)** based on mentioned attack chains and the requirement of having a valid backend user session (authenticated).\n\n### Solution\nUpdate to TYPO3 versions 9.5.20 or 10.4.6 that fix the problem described.\n\n### Credits\nThanks to TYPO3 security team member Oliver Hader who reported and fixed the issue.\n\n### References\n* [TYPO3-CORE-SA-2020-008](https://typo3.org/security/advisory/typo3-core-sa-2020-008)","severity":"high","score":8.8,"published":"2020-07-29T16:15:19.000Z","modified":"2026-07-08T06:01:01.686Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"typo3/cms-core","sources":[{"name":"OSV · GHSA-m5vr-3m74-jwxp","url":"https://osv.dev/vulnerability/GHSA-m5vr-3m74-jwxp"}],"ranges":[{"events":[{"introduced":"9.0.0"},{"fixed":"9.5.20"}],"type":"ECOSYSTEM"}],"versions":["v9.0.0","v9.1.0","v9.2.0","v9.2.1","v9.3.0","v9.3.1","v9.3.2","v9.3.3","v9.4.0","v9.5.0","v9.5.1","v9.5.10","v9.5.11","v9.5.12","v9.5.13","v9.5.14","v9.5.15","v9.5.16","v9.5.17","v9.5.18","v9.5.19","v9.5.2","v9.5.3","v9.5.4","v9.5.5","v9.5.6","v9.5.7","v9.5.8","v9.5.9"],"fixed":["9.5.20"]},{"ecosystem":"Packagist","name":"typo3/cms-core","sources":[{"name":"OSV · GHSA-m5vr-3m74-jwxp","url":"https://osv.dev/vulnerability/GHSA-m5vr-3m74-jwxp"}],"ranges":[{"events":[{"introduced":"10.0.0"},{"fixed":"10.4.6"}],"type":"ECOSYSTEM"}],"versions":["v10.0.0","v10.1.0","v10.2.0","v10.2.1","v10.2.2","v10.3.0","v10.4.0","v10.4.1","v10.4.2","v10.4.3","v10.4.4","v10.4.5"],"fixed":["10.4.6"]},{"ecosystem":"Packagist","name":"typo3/cms","sources":[{"name":"OSV · GHSA-m5vr-3m74-jwxp","url":"https://osv.dev/vulnerability/GHSA-m5vr-3m74-jwxp"}],"ranges":[{"events":[{"introduced":"10.0.0"},{"fixed":"10.4.6"}],"type":"ECOSYSTEM"}],"versions":["v10.0.0","v10.1.0","v10.2.0","v10.2.1","v10.2.2","v10.3.0","v10.4.0","v10.4.1","v10.4.2","v10.4.3","v10.4.4","v10.4.5"],"fixed":["10.4.6"]},{"ecosystem":"Packagist","name":"typo3/cms","sources":[{"name":"OSV · GHSA-m5vr-3m74-jwxp","url":"https://osv.dev/vulnerability/GHSA-m5vr-3m74-jwxp"}],"ranges":[{"events":[{"introduced":"9.0.0"},{"fixed":"9.5.20"}],"type":"ECOSYSTEM"}],"versions":["v9.0.0","v9.1.0","v9.2.0","v9.2.1","v9.3.0","v9.3.1","v9.3.2","v9.3.3","v9.4.0","v9.5.0","v9.5.1","v9.5.10","v9.5.11","v9.5.12","v9.5.13","v9.5.14","v9.5.15","v9.5.16","v9.5.17","v9.5.18","v9.5.19","v9.5.2","v9.5.3","v9.5.4","v9.5.5","v9.5.6","v9.5.7","v9.5.8","v9.5.9"],"fixed":["9.5.20"]}],"sourceAffected":[],"references":["https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-m5vr-3m74-jwxp","https://nvd.nist.gov/vuln/detail/CVE-2016-5091","https://nvd.nist.gov/vuln/detail/CVE-2020-15098","https://github.com/TYPO3/TYPO3.CMS/commit/85d3e70dff35a99ef53f4b561114acfa9e5c47e1","https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2020-15098.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2020-15098.yaml","https://github.com/TYPO3/TYPO3.CMS","https://typo3.org/security/advisory/typo3-core-sa-2016-013","https://typo3.org/security/advisory/typo3-core-sa-2020-008"],"sources":[{"name":"OSV","id":"GHSA-m5vr-3m74-jwxp","modified":"2026-07-08T06:01:01.686168987Z","url":"https://osv.dev/vulnerability/GHSA-m5vr-3m74-jwxp"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T21:55:33.923Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}