Description
A policy-enforcement flaw in Zimbra Collaboration Suite allows an authenticated user to bypass disabled mail forwarding by using a Sieve notify action to send copies of email content and headers to an arbitrary address.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Zimbra | Zimbra Collaboration Suite | < 10.1.20 | 10.1.20 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
HORKimhab/CVE-2026-50055 ★ 0 · Jul 22, 2026
CVE-2026-50055 - Draft
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- WID-SEC-2026-2429 Synacor Zimbra: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2026
References
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories vendor-advisory