8.7

CVE-2024-52815: element-hq synapse Improper Input Validation

CVSS: 8.7v4.0HighAnalyzed
AliasesGHSA-f3r3-h2mq-hx2hPYSEC-2026-1611UBUNTU-CVE-2024-52815
Published 03-12-2024Last modified 03-12-2024
Open JSON

Vulnerability summary

CVE-2024-52815 is a high (CVSS 8.7) Improper Input Validation vulnerability in element-hq synapse. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.1% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.57%
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. Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality. Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

0.00 pp

From 0.57% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.57%

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
Matrix1 product
PyPI1 product
  • matrix-synapse< 1.120.1
Ubuntu1 product
  • matrix-synapseAll versions (No fix recorded)

5 vendors · 5 products

References

8 links