CVE-2018-12291

HIGHNVD 7.57.5—Trending — 3 sources updated this week

7.5

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.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 53.5%
KEV: Not listed

Published

June 13, 2018

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://github.com/matrix-org/synapse/pull/3371
cve@mitrehttps://github.com/matrix-org/synapse/releases/tag/v0.31.1
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/synapse/pull/3371
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/synapse/releases/tag/v0.31.1

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	matrix-synapse (0.24.0+dfsg-1ubuntu0.1~esm1) @ bionic	2026-05-28	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
matrix-synapse	—	0.31.1	—

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

UbuntuUSN-6076-1MEDIUM
Synapse vulnerabilities

Data Freshness Timeline

(refreshed 12× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 06:42 UTCEG score recompute
2026-05-28 06:42 UTCVendor advisory
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 04:46 UTCOSV refresh

Frequently asked(5)

What is CVE-2018-12291?

CVE-2018-12291 is a high vulnerability published on June 13, 2018. The ongetmissingevents function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the getmissing_events federation API where event visibility rules were not applied correctly.

When was CVE-2018-12291 disclosed?

CVE-2018-12291 was first published in the National Vulnerability Database on June 13, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-12291 actively exploited?

CVE-2018-12291 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 53.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-12291?

CVE-2018-12291 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2018-12291?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-12291, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2018-12291

📅 Published

🔄 Last Modified

🔗 References (4)