4.3

CVE-2024-53867: element-hq synapse

CVSS: 4.3v3.1MediumDeferred
AliasesGHSA-56w4-5538-8v8hPYSEC-2026-1610UBUNTU-CVE-2024-53867
Published 03-12-2024Last modified 03-12-2024
Open JSON

Vulnerability summary

CVE-2024-53867 is a medium (CVSS 4.3) vulnerability in element-hq synapse. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 37% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.44%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2024:14541-1

Timeline

  1. 03-12-2024
    PublishedVulnerability first disclosed.
  2. 03-12-2024
    Last modifiedVulnerability information updated.

Description

Synapse is an open-source Matrix homeserver. The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. This vulnerability is fixed in 1.120.1.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.44%

Chance of exploitation in the next 30 days

Percentile

37%

Versus all other CVEs

30-day change

0.00 pp

From 0.44% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.44%

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

Affected systems

Debian1 product
  • matrix-synapse< 1.121.0-1
Element-hq1 product
PyPI1 product
  • matrix-synapse≥ 1.113.0rc1, < 1.120.1
Ubuntu1 product
  • matrix-synapse< 0.24.0+dfsg-1ubuntu0.1~esm1 | < 1.11.0-1 | < 1.53.0-1 | < 1.100.0-1ubuntu1

4 vendors · 4 products

References

9 links