Remote Signing Vulnerability in Continuwuity Matrix Homeserver by Continuwuity
CVE-2026-24471

9.3CRITICAL

Key Information:

Vendor

Continuwuity

Status
Continuwuity
Vendor
CVE Published:
2 February 2026

What is CVE-2026-24471?

A vulnerability in the Continuwuity Matrix homeserver allows attackers to exploit user interactions by causing the local server to sign arbitrary events. This occurs when a user attempts to leave, join, or knock on a room. If the victim server requests assistance from a malicious remote server, the attacker can provide a crafted event that the victim server will unwittingly sign and send back to the attacker. This poses significant security risks, particularly for all Conduit-derived servers, where user input can inadvertently compromise server integrity.

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Affected Version(s)

continuwuity < 0.5.1

References

https://github.com/continuwuity/continuwuity/security/adv...
x_refsource_CONFIRM
https://forgejo.ellis.link/continuwuation/continuwuity/co...
x_refsource_MISC

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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