7.5

CVE-2018-12291: matrix synapse

CVSS: 7.5v3.0HighModified
AliasesGHSA-v8wm-g9f2-xjv4PYSEC-2026-664UBUNTU-CVE-2018-12291
Published 13-06-2018Last modified 17-09-2024
Open JSON

Vulnerability summary

CVE-2018-12291 is a high (CVSS 7.5) vulnerability in matrix synapse. EPSS estimates a 1.79% chance of exploitation in the next 30 days, higher than 78% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
1.79%
0%100%
Low · -0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2024:11041-1USN-6076-1

Timeline

  1. 13-06-2018
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.79%

Chance of exploitation in the next 30 days

Percentile

78%

Versus all other CVEs

30-day change

-0.03 pp

From 1.82% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.79%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Debian1 product
  • matrix-synapse< 0.31.1+dfsg-1
Matrix1 product
PyPI1 product
  • matrix-synapse< 0.31.1
Ubuntu1 product
  • matrix-synapse< 0.24.0+dfsg-1ubuntu0.1~esm1

4 vendors · 4 products

References

11 links
Show all 11 references