Matrix Synapse before 0.33.3.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation
Published Sep 18, 2018
8.8
HIGHCVSS 3.0
EPSS 1.54%
Description
Matrix Synapse before 0.33.3.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation.
Affected products
No data.
Configuration 2
- 8.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:S/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.54% (0.01538) | 74.00th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.54% (0.01538) | 73.75th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.31% (0.00310) | 70.32th | v3 (v2023.03.01) |
| Jul 3, 2024 | 0.31% (0.00310) | 70.22th | v3 (v2023.03.01) |
| May 7, 2024 | 0.43% (0.00425) | 74.21th | v3 (v2023.03.01) |
| Mar 27, 2024 | 0.60% (0.00602) | 78.05th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.60% (0.00602) | 76.05th | v3 (v2023.03.01) |
| Sep 12, 2023 | 0.66% (0.00660) | 77.08th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.65% (0.00654) | 76.88th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.33% (0.00325) | 66.11th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.06% (0.01061) | 52.82th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.06% (0.01061) | 28.23th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.05% (0.01046) | 28.66th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.05% (0.01046) | 0.00th | v1 |
References (10)
- https://github.com/advisories/GHSA-fmvh-rvq5-hhjx Advisory
- https://github.com/matrix-org/synapse/commit/5bf8bc79ebc22c61968f2eb487714813fccbdb9b
- https://github.com/matrix-org/synapse/commit/804dd41e18c449e711e443398b95c9f6c68b6fa2
- https://github.com/matrix-org/synapse/commit/a5a0bf5cf71caed3c4e3677d2bce667c147dadfc
- https://github.com/matrix-org/synapse/commit/c127c8d0421f0228a46ebbe280c9537e8d8ea42b
- https://github.com/matrix-org/synapse/issues/3796#event-1833126269 x_refsource_CONFIRMPatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IRW7YR2H3ASUSYX4AO4KMY3FNVDNYW3P/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IRW7YR2H3ASUSYX4AO4KMY3FNVDNYW3P/
- https://matrix.org/blog/2018/09/06/critical-security-update-synapse-0-33-3-1/ x_refsource_CONFIRMVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-16515
Change history (0)
No recorded changes yet.