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CVE-2024-52815

Synapse allows a a malformed invite to break the invitee's `/sync`

8.7 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.57%Up 0.5 points since Dec 4, 2024
90%50%10%1%

What each source reports

CVE List Score used 8.7

Synapse allows a a malformed invite to break the invitee's `/sync`

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.

Record
CVE-2024-52815
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-20
Updated
2026-11-02
EUVDEUVD-2024-3463 8.7

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.

Record
EUVD-2024-3463
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-f3r3-h2mq-hx2h 8.7

Synapse allows a a malformed invite to break the invitee's `/sync`

Impact

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.

Patches

Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.

Workarounds

Server administrators can disable federation from untrusted servers.

For more information

If you have any questions or comments about this advisory, please email us at security at element.io.

Record
GHSA-f3r3-h2mq-hx2h
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-20
Updated
2026-11-02
NVD 8.7

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.

Record
CVE-2024-52815
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-20
Updated
2026-11-02
OSVALPINE-CVE-2024-52815 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 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.

Record
ALPINE-CVE-2024-52815
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-03
OSV 8.7

Synapse allows a a malformed invite to break the invitee's `/sync`

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.

Record
CVE-2024-52815
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-20
Updated
2026-11-02
Show 5 moreShow less
OSVDEBIAN-CVE-2024-52815 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 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.

Record
DEBIAN-CVE-2024-52815
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVGHSA-f3r3-h2mq-hx2h 8.7

Synapse allows a a malformed invite to break the invitee's `/sync`

Impact

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.

Patches

Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.

Workarounds

Server administrators can disable federation from untrusted servers.

For more information

If you have any questions or comments about this advisory, please email us at security at element.io.

Record
GHSA-f3r3-h2mq-hx2h
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-20
Updated
2026-11-02
OSVPYSEC-2026-1611 8.7

Synapse allows a a malformed invite to break the invitee's `/sync`

Impact

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.

Patches

Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.

Workarounds

Server administrators can disable federation from untrusted servers.

For more information

If you have any questions or comments about this advisory, please email us at security at element.io.

Record
PYSEC-2026-1611
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
OSVUBUNTU-CVE-2024-52815 8.7

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.

Record
UBUNTU-CVE-2024-52815
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVopenSUSE-SU-2024:14541-1 No score

matrix-synapse-1.120.2-1.1 on GA media

These are all security issues fixed in the matrix-synapse-1.120.2-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:14541-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
matrix-synapse
PyPI
 before 1.120.1
1.120.1
synapse
Alpine:v3.20
 before 1.120.1
1.120.1
synapse
Alpine:v3.21
 before 1.120.2-r0
1.120.2-r0
synapse
Alpine:v3.22
 before 1.120.2-r0
1.120.2-r0
synapse
Alpine:v3.23
 before 1.120.2-r0
1.120.2-r0
synapse
Alpine:v3.24
 before 1.120.2-r0
1.120.2-r0
matrix-synapse
PyPI
 before 1.120.1, plus listed versions
0.33.50.33.5.10.33.60.33.6rc10.33.7
Show 45 moreShow less
0.33.7rc10.33.7rc20.33.80.33.8rc20.33.90.34.00.34.0.10.34.0rc10.34.0rc20.34.1.10.99.00.99.0rc10.99.0rc20.99.0rc30.99.0rc40.99.10.99.1.10.99.1rc10.99.1rc20.99.20.99.2rc10.99.30.99.3.10.99.3.20.99.3rc10.99.40.99.4rc10.99.50.99.5.10.99.5.20.99.5rc11.0.01.0.0rc11.0.0rc21.0.0rc31.1.01.1.0rc11.1.0rc21.10.01.10.0rc11.10.0rc21.10.0rc31.10.0rc51.10.11.100.0
1.120.1
matrix-synapse
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
0.19.2+dfsg-60.24.0+dfsg-10.24.0+dfsg-1ubuntu0.1~esm10.24.0+dfsg-1ubuntu0.1~esm4
 None known
matrix-synapse
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1.3.0-11.4.0-11.5.0-11.5.1-11.6.0-1
Show 12 moreShow less
1.6.1-11.7.0-21.7.1-11.7.2-11.7.3-11.8.0-11.9.0-11.9.1-11.10.0-11.10.0-21.11.0-11.11.0-1ubuntu0.1~esm2
 None known
matrix-synapse
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
1.39.0-11.47.0-21.47.1-11.48.0-11.49.0-1
Show 7 moreShow less
1.49.2-11.50.1-11.50.2-11.51.0-11.52.0-11.53.0-11.53.0-1ubuntu0.1~esm2
 None known
matrix-synapse
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.90.0-11.100.0-1ubuntu1
 None known
matrix-synapse
openSUSE:Tumbleweed
From an advisory covering 6 CVEs
 before 1.120.2-1.1
1.120.2-1.1

History

History
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
affected
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-52815 is a high vulnerability (CVSS 8.7) in Element-hq Synapse, published December 3, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.57%, the 47th percentile. Fixed in matrix-synapse 1.120.1.

References

Show 10 moreShow less
This page doesn't list everything

Left out here: 365 versions. The JSON record has them.

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