CVSS 3.0
7.5 highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2019-11842
High (7.5) in matrix. EPSS 1.8% chance of exploitation in the next 30 days. Fixed in matrix-sydent 1.0.3.
An issue was discovered in Matrix Sydent before 1.0.3 and Synapse before 0.99.3.1. Random number generation is mishandled, which makes it easier for attackers to predict a Sydent authentication token or a Synapse random ID.
Severity
- EPSS
- 1.8% chance of exploitation in the next 30 days; higher than 78% of CVEs (scores of 2026-10-31)
- CWE
- CWE-338
- Published
- Modified
- Record from
- the NVD, synced
Affected
- matrix:sydent
- matrix:synapse
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-gwf7-vfjf-wf6x | PyPI | matrix-sydent | <1.0.3 | 1.0.3 |
| GHSA-gwf7-vfjf-wf6x | PyPI | matrix-synapse | <0.99.3.1 | 0.99.3.1 |
| PYSEC-2019-185 | PyPI | matrix-synapse | <0.99.3.1 | 0.99.3.1 |
| PYSEC-2026-2620 | PyPI | matrix-sydent | <1.0.3 | 1.0.3 |