CVE-2024-51750: Element allows a malicious homeserver can modify events leading to unrenderable events or rooms

Severity: medium (CVSS 5.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-12 · updated 2026-06-17
Weakness: CWE-248

Description

Element is a Matrix web client built using the Matrix React SDK. A malicious homeserver can send invalid messages over federation which can prevent Element Web and Desktop from rendering single messages or the entire room containing them. This was patched in Element Web and Desktop 1.11.85.

Affected products

element-hq element-web: before 1.11.85

References

https://github.com/element-hq/element-web/commit/231073c578d5f92b33cde7aa2b0b9c5836b2dc48
https://github.com/element-hq/element-web/security/advisories/GHSA-w36j-v56h-q9pc

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