Medium severity · published Dec 3, 2024
CVE-2024-52815
Synapse allows a a malformed invite to break the invitee's `/sync`
5.3
CVSS
0.6%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SY
synapse · element-hq
< 1.120.1 · source: vendor, NVD, CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-52815
CVE.org
https://www.cve.org/CVERecord?id=CVE-2024-52815
Vendor Advisory
https://github.com/element-hq/synapse/security/advisories/GHSA-f3r3-h2mq-hx2h
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