HIGH
In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.power_levels event in force
Published Jun 14, 2018
7.5
HIGHCVSS 3.0
EPSS 1.84%
Description
In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.power_levels event in force.
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:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact High
Availability Impact None
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
1.84% 0.01840
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.01840
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 (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.84% (0.01840) | 78.20th | v5 (v2026.06.15) |
| Aug 31, 2026 | 1.84% (0.01840) | 77.46th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.07% (0.00072) | 31.56th | v3 (v2023.03.01) |
| May 23, 2024 | 0.07% (0.00072) | 30.85th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.07% (0.00071) | 28.83th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.06% (0.00064) | 25.67th | v3 (v2023.03.01) |
| Nov 5, 2023 | 0.13% (0.00133) | 48.18th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.12% (0.00117) | 44.65th | v3 (v2023.03.01) |
| Jun 8, 2023 | 0.21% (0.00215) | 58.21th | v3 (v2023.03.01) |
| May 8, 2023 | 0.21% (0.00205) | 56.92th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.11% (0.00112) | 42.77th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Sep 2, 2022 | 0.95% (0.00954) | 34.50th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00954) | 32.50th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00954) | 16.28th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.83% (0.00833) | 24.58th | v1 |
| Jan 6, 2022 | 0.83% (0.00833) | 23.96th | v1 |
| Sep 1, 2021 | 0.83% (0.00833) | 57.50th | v1 |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
Weaknesses (0)
No CWE recorded.
References (5)
- https://bugs.debian.org/901549 x_refsource_MISCMailing ListThird Party Advisory
- https://github.com/advisories/GHSA-ch5v-fhg8-7gv9 Advisory
- https://github.com/matrix-org/matrix-doc/issues/1304 x_refsource_MISCThird Party Advisory
- https://matrix.org/blog/2018/06/14/security-update-synapse-0-31-2/ x_refsource_MISCVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-12423
| Link | Providers | Tags |
|---|---|---|
| https://bugs.debian.org/901549 | x_refsource_MISCMailing ListThird Party Advisory | |
| https://github.com/advisories/GHSA-ch5v-fhg8-7gv9 | Advisory | |
| https://github.com/matrix-org/matrix-doc/issues/1304 | x_refsource_MISCThird Party Advisory | |
| https://matrix.org/blog/2018/06/14/security-update-synapse-0-31-2/ | x_refsource_MISCVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-12423 |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jun 14, 2018
Updated Sep 16, 2024
Reserved Jun 14, 2018
Link CVE-2018-12423
CISA Vulnrichment
GHSA-CH5V-FHG8-7GV9 Updated n/a