CVE-2026-93638
MEDIUM
MEDIUM
Priority: 0.02
BB Relevance:
62/100
Published: 2026-10-23
Modified: 2026-10-28
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Auth
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
Required
S:
Changed
C:
Low
I:
Low
A:
None
Description
A reflected cross-site scripting vulnerability in the login page of Zimbra Collaboration Suite (ZCS) allows an unauthenticated attacker to execute JavaScript through the zrememberme parameter. A crafted relogin URL selects a two-factor error display that inserts the parameter into a hidden input attribute without HTML encoding. A victim who opens the URL receives attacker-controlled script and page content under the legitimate Zimbra origin, allowing credential capture through a replacement login form. The relogin path logs out an existing session before rendering the payload, so the demonstrated attack does not inherit that session's mailbox access. ZCS 10.1.16 and 10.1.17 are affected.
Weakness Classification (1)
Affected Software (4)
| Vendor | Product | Version |
|---|---|---|
| Zimbra | Zimbra Collaboration Suite | 0 |
| Zimbra | Zimbra Collaboration Suite | 0 |
| synacor | zimbra_collaboration_suite | < 10.1.17 |
| synacor | zimbra_collaboration_suite | < 10.1.17 |
References & Advisories (2)
Vendor Advisory
Exploit
Third Party Advisory