CVE-2020-26547

9.8 criticalEPSS 0.6%

Critical (9.8) in monal monal. EPSS 0.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-31)
CWE: CWE-345
Published: 2021-02-01
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

monal:monal

References

https://github.com/anurodhp/Monal/commits/develop
https://monal.im/blog/cve-2020-26547/
https://github.com/anurodhp/Monal/commits/develop
https://monal.im/blog/cve-2020-26547/

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