HIGH
The on_get_missing_events function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the get_missing_events federation API where event visibility rules were not applied correctly
Published Jun 13, 2018
7.5
HIGHCVSS 3.0
EPSS 1.82%
Description
The on_get_missing_events function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the get_missing_events federation API where event visibility rules were not applied correctly.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.5 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact None
Availability Impact None
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
1.82% 0.01820
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.01820
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.82% (0.01820) | 77.98th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.80% (0.01805) | 75.65th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.13% (0.00133) | 48.98th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.13% (0.00133) | 48.62th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.13% (0.00129) | 46.60th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.12% (0.00120) | 44.95th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.15% (0.00149) | 50.07th | v3 (v2023.03.01) |
| May 8, 2023 | 0.19% (0.00193) | 55.48th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.15% (0.00149) | 49.20th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00885) | 26.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.62% (0.00624) | 17.80th | v1 |
| Jan 6, 2022 | 0.62% (0.00624) | 17.24th | v1 |
| Sep 1, 2021 | 0.62% (0.00624) | 45.04th | v1 |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
Weaknesses (0)
No CWE recorded.
References (5)
- https://github.com/advisories/GHSA-v8wm-g9f2-xjv4 Advisory
- https://github.com/matrix-org/synapse/commit/0834b49c6a9b6c597a154d4b2dfcf8fff90699ec
- https://github.com/matrix-org/synapse/pull/3371 x_refsource_CONFIRMPatchThird Party Advisory
- https://github.com/matrix-org/synapse/releases/tag/v0.31.1 x_refsource_CONFIRMThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-12291
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-v8wm-g9f2-xjv4 | Advisory | |
| https://github.com/matrix-org/synapse/commit/0834b49c6a9b6c597a154d4b2dfcf8fff90699ec | ||
| https://github.com/matrix-org/synapse/pull/3371 | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://github.com/matrix-org/synapse/releases/tag/v0.31.1 | x_refsource_CONFIRMThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-12291 |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jun 13, 2018
Updated Sep 17, 2024
Reserved Jun 13, 2018
Link CVE-2018-12291
CISA Vulnrichment
GHSA-V8WM-G9F2-XJV4 Updated n/a