CVE-2024-52815: Synapse is an open-source Matrix homeserver

Q: How do I fix CVE-2024-52815?

synapse: upgrade to 1.120.1. Exact commands for each OS are on this page.

Q: Is CVE-2024-52815 being exploited?

CVE-2024-52815 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-52815 affect?

CVE-2024-52815 affects synapse. Severity is medium (CVSS 5.3). 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 invit

Q: How urgent is CVE-2024-52815?

Priority 35/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2024-52815 is a medium-severity flaw (CVSS 5.3) affecting synapse. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-20
Published	2024-12-03
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: matrix

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-12-03 17:15 UTCPublished CVE record published
2026-06-17 08:07 UTCUpdated Record last modified

matrix synapse UPGRADE

Affected: < 1.120.1

Fixed in: 1.120.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy synapse || rpm -q synapse || synapse --version

2. UPGRADE to 1.120.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade synapse

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade synapse

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-52815?

synapse: upgrade to 1.120.1. Exact commands for each OS are on this page.

Is CVE-2024-52815 being exploited?

CVE-2024-52815 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-52815 affect?

CVE-2024-52815 affects synapse. Severity is medium (CVSS 5.3). 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 invit

How urgent is CVE-2024-52815?

Priority 35/100. Remotely exploitable, no login, no user action

Related CVEs

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References

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