CVE-2020-26547

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

No affected versions have been published.

Timeline

Published
Feb 1, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2020-26547: Critical severity, CVSS 9.8 | Vulnix