Is CVE-2020-26547 actively exploited?

No active exploitation of CVE-2020-26547 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-26547 be exploited remotely?

Yes. CVE-2020-26547 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-26547?

CVE-2020-26547 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-26547

CRITICAL

CVE-2020-26547

CWE-345Published: February 1, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-26547 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.