VULNERABILITY INTELLIGENCE

CVE-2020-26547

CVSS score9.8 CRITICAL

EPSS probability0.56%

CISA KEVNot currently listed

Published2021-02-01

Last modified2026-06-17

Description

Monal before 4.9 does not implement proper sender verification on MAM and Message Carbon (XEP-0280) results. This allows a remote attacker (able to send stanzas to a victim) to inject arbitrary messages into the local history, with full control over the sender and receiver displayed to the victim.