CVE-2020-26547 Missing authorization in n/a
Remote attackers can inject arbitrary messages into Monal's local history by bypassing sender verification on MAM and Message Carbon results.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-26547?
CVE-2020-26547 is a critical missing authorization vulnerability in n/a, published on 1 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-345
Which versions are affected by CVE-2020-26547?
It affects 1 product.
Products include Monal Monal.
How do I fix CVE-2020-26547?
No fix has been published for CVE-2020-26547 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2020-26547 being exploited?
There is no known exploitation of CVE-2020-26547 in the wild and no public exploit code.
Sources
Also known as GHSA-rf7j-w28r-v7m8.