| Package | Affected versions | Patched versions |
|---|---|---|
| collaboration | = 8.8.15= 9.0.0≥ 8.8, < 8.8.15 | 8.8.15 |
An issue was discovered in ProxyServlet.java in the /proxy servlet in Zimbra Collaboration Suite 8.8 before 8.8.15 Patch 23 and 9.x before 9.0.0 Patch 16. The value of the X-Host header overwrites the value of the Host header in proxied requests. The value of X-Host header is not checked against the whitelist of hosts Zimbra is allowed to proxy to (the zimbraProxyAllowedDomains setting).
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