High severity7.5NVD Advisory· Published Jun 13, 2018· Updated Jun 17, 2026
CVE-2018-12291
CVE-2018-12291
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-synapsePyPI | < 0.31.1 | 0.31.1 |
Affected products
2- ghsa-coords2 versions
< 0.31.1+ 1 more
- (no CPE)range: < 0.31.1
- (no CPE)range: < 1.43.0-1.1
Patches
Vulnerability mechanics
References
5- github.com/matrix-org/synapse/pull/3371nvdPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-v8wm-g9f2-xjv4ghsaADVISORY
- github.com/matrix-org/synapse/releases/tag/v0.31.1nvdThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2018-12291ghsaADVISORY
- github.com/matrix-org/synapse/commit/0834b49c6a9b6c597a154d4b2dfcf8fff90699ecghsaWEB
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