VulnerabilityAnalyzed

CVE-2024-52815

This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality.

HIGH 8.7EPSS 0.57%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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 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/M
EPSS: 0.57% probability · 45th percentile
CISA KEV: Not listed
Weakness: CWE-20
Affected: matrix/synapse
Source: security-advisories@github.com

References

https://github.com/element-hq/synapse/security/advisories/GHSA-f3r3-h2mq-hx2hVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.