Zimbra Collaboration Suite up to 10.1.17 Login Page zrememberme cross site scripting

Summaryinfo

A vulnerability was found in Zimbra Collaboration Suite up to 10.1.17. It has been classified as problematic. Affected is an unknown function of the component Login Page. This manipulation of the argument zrememberme causes cross site scripting. This vulnerability is handled as CVE-2026-93638. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Zimbra Collaboration Suite up to 10.1.17. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component Login Page. The manipulation of the argument zrememberme with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at wiki.zimbra.com. This vulnerability is known as CVE-2026-93638 since 09/18/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Groupware Software

Vendor

• Zimbra

Name

• Collaboration Suite

Version

• 10.1.0
• 10.1.1
• 10.1.2
• 10.1.3
• 10.1.4
• 10.1.5
• 10.1.6
• 10.1.7
• 10.1.8
• 10.1.9
• 10.1.10
• 10.1.11
• 10.1.12
• 10.1.13
• 10.1.14
• 10.1.15
• 10.1.16
• 10.1.17

CPE 2.3info

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CPE 2.2info

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Entryinfo

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