Concrete CMS 5.6
Support for Concrete CMS 5.6 ended on 26/02/2019. There are no more security updates for this branch.
Latest version: 5.6.4.0, released on 26/02/2019
End of support: 26/02/2019
135 known vulnerabilities open in 5.6.4.0
Vulnerabilities in Concrete CMS 5.6
137 vulnerabilities from the NVD affect at least one version of this branch. Last checked on 02/11/2026.
- CVE-2023-48648, CVSS 3.1: 9.8: still open in 5.6.4.0
- CVE-2022-21829, CVSS 3.1: 9.8: still open in 5.6.4.0
- CVE-2021-40098, CVSS 3.1: 9.8: still open in 5.6.4.0
- CVE-2021-22958, CVSS 3.1: 9.8: still open in 5.6.4.0
- CVE-2026-8134, CVSS 4.0: 9.4: still open in 5.6.4.0
- CVE-2022-30117, CVSS 3.1: 9.1: still open in 5.6.4.0
- CVE-2021-40102, CVSS 3.1: 9.1: still open in 5.6.4.0
- CVE-2026-8135, CVSS 4.0: 8.9: still open in 5.6.4.0
- CVE-2026-3452, CVSS 4.0: 8.9: still open in 5.6.4.0
- CVE-2022-43693, CVSS 3.1: 8.8: still open in 5.6.4.0
- CVE-2021-40108, CVSS 3.1: 8.8: still open in 5.6.4.0
- CVE-2021-40097, CVSS 3.1: 8.8: still open in 5.6.4.0
- CVE-2021-22966, CVSS 3.1: 8.8: still open in 5.6.4.0
- CVE-2021-22954, CVSS 3.1: 8.8: still open in 5.6.4.0
- CVE-2026-81895, CVSS 4.0: 8.5: still open in 5.6.4.0
- CVE-2026-81894, CVSS 4.0: 8.5: still open in 5.6.4.0
- CVE-2026-18111, CVSS 4.0: 8.5: still open in 5.6.4.0
- CVE-2026-81896, CVSS 4.0: 8.4: still open in 5.6.4.0
- CVE-2026-85385, CVSS 4.0: 7.7: still open in 5.6.4.0
- CVE-2026-81897, CVSS 4.0: 7.7: still open in 5.6.4.0
- CVE-2026-8428, CVSS 4.0: 7.5: still open in 5.6.4.0
- CVE-2026-8426, CVSS 4.0: 7.5: still open in 5.6.4.0
- CVE-2026-8421, CVSS 4.0: 7.5: still open in 5.6.4.0
- CVE-2026-8417, CVSS 4.0: 7.5: still open in 5.6.4.0
- CVE-2026-8350, CVSS 4.0: 7.5: still open in 5.6.4.0
- CVE-2026-8140, CVSS 4.0: 7.5: still open in 5.6.4.0
- CVE-2021-40104, CVSS 3.1: 7.5: still open in 5.6.4.0
- CVE-2021-40103, CVSS 3.1: 7.5: still open in 5.6.4.0
- CVE-2021-22970, CVSS 3.1: 7.5: still open in 5.6.4.0
- CVE-2021-22967, CVSS 3.1: 7.5: still open in 5.6.4.0
- CVE-2021-22951, CVSS 3.1: 7.5: still open in 5.6.4.0
- CVE-2026-85386, CVSS 4.0: 7.3: still open in 5.6.4.0
- CVE-2026-8203, CVSS 4.0: 7.3: still open in 5.6.4.0
- CVE-2026-8197, CVSS 4.0: 7.3: still open in 5.6.4.0
- CVE-2026-81900, CVSS 4.0: 7.3: still open in 5.6.4.0
- CVE-2021-40101, CVSS 3.1: 7.2: still open in 5.6.4.0
- CVE-2021-40099, CVSS 3.1: 7.2: still open in 5.6.4.0
- CVE-2021-36766, CVSS 3.1: 7.2: still open in 5.6.4.0
- CVE-2021-22968, CVSS 3.1: 7.2: still open in 5.6.4.0
- CVE-2020-24986, CVSS 3.1: 7.2: still open in 5.6.4.0
- CVE-2020-11476, CVSS 3.1: 7.2: still open in 5.6.4.0
- CVE-2026-18119, CVSS 4.0: 7.0: still open in 5.6.4.0
- CVE-2026-6826, CVSS 4.0: 6.9: still open in 5.6.4.0
- CVE-2022-43686, CVSS 3.1: 6.5: still open in 5.6.4.0
- CVE-2021-22950, CVSS 3.1: 6.5: still open in 5.6.4.0
- CVE-2021-40109, CVSS 3.1: 6.4: still open in 5.6.4.0
- CVE-2026-8337, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-8240, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-8239, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-8238, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-8237, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-8236, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-8205, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-8204, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-7881, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-7879, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2026-18120, CVSS 4.0: 6.3: still open in 5.6.4.0
- CVE-2022-43690, CVSS 3.1: 6.3: still open in 5.6.4.0
- CVE-2026-81907, CVSS 4.0: 6.1: still open in 5.6.4.0
- CVE-2023-28475, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2022-43968, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2022-43967, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2022-43694, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2022-43692, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2022-43556, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2022-30120, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2022-30119, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2022-30118, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2021-40106, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2021-40105, CVSS 3.1: 6.1: still open in 5.6.4.0
- CVE-2026-8245, CVSS 4.0: 6.0: still open in 5.6.4.0
- CVE-2026-81912, CVSS 4.0: 5.7: still open in 5.6.4.0
- CVE-2023-48649, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2023-28820, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2023-28819, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2023-28477, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2023-28476, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2023-28474, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2023-28471, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2022-43687, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2021-40100, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2021-28145, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2021-22953, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2021-22949, CVSS 3.1: 5.4: still open in 5.6.4.0
- CVE-2026-8327, CVSS 4.0: 5.3: still open in 5.6.4.0
- CVE-2026-68526, CVSS 4.0: 5.3: still open in 5.6.4.0
- CVE-2023-28821, CVSS 3.1: 5.3: still open in 5.6.4.0
- CVE-2023-28472, CVSS 3.1: 5.3: still open in 5.6.4.0
- CVE-2022-43691, CVSS 3.1: 5.3: still open in 5.6.4.0
- CVE-2022-43689, CVSS 3.1: 5.3: still open in 5.6.4.0
- CVE-2021-22969, CVSS 3.1: 5.3: still open in 5.6.4.0
- CVE-2020-14961, CVSS 3.1: 5.3: still open in 5.6.4.0
- CVE-2017-18195, CVSS 3.1: 5.3: still open in 5.6.4.0
- CVE-2026-81917, CVSS 4.0: 5.1: still open in 5.6.4.0
- CVE-2026-81916, CVSS 4.0: 5.1: still open in 5.6.4.0
- CVE-2026-81915, CVSS 4.0: 5.1: still open in 5.6.4.0
- CVE-2025-3153, CVSS 4.0: 5.1: still open in 5.6.4.0
- CVE-2024-4350, CVSS 4.0: 5.1: still open in 5.6.4.0
- CVE-2026-81918, CVSS 4.0: 4.8: still open in 5.6.4.0
- CVE-2026-3244, CVSS 4.0: 4.8: still open in 5.6.4.0
And 37 more.
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