CVE-2026-50054 Privilege escalation in Zimbra Collaboration Suite
Authenticated attackers can grant themselves undocumented loginAs rights, enabling persistent mailbox access and mail-sending authority in Zimbra Collaboration Suite.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-50054?
CVE-2026-50054 is a high-severity vulnerability in Zimbra Collaboration Suite, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An authorization flaw in Zimbra Collaboration Suite’s GrantRightsRequest allows an attacker with access to an authenticated account to grant another local account the loginAs right, creating persistent mailbox access and mail-sending authority that survives password changes and session expiry.
Weakness: CWE-269
Which versions are affected by CVE-2026-50054?
How do I fix CVE-2026-50054?
No fix has been published for CVE-2026-50054 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-50054 being exploited?
There is no known exploitation of CVE-2026-50054 in the wild and no public exploit code.
Sources
Also known as GHSA-6c75-c59q-9624.