CVE-2026-50053

Published: Ott 23, 2026 Last Modified: Ott 23, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 8,7
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: low
User Interaction: required
Scope: changed
Confidentiality: high
Integrity: high
Availability: none

Description

A request attribute override vulnerability in Zimbra Collaboration Suite (ZCS) allows unauthenticated requests to /h/* to populate servlet attributes intended for trusted internal dispatch. RestFilter copies URL parameters specifying an authentication token, target account, target item and dispatch state into the request attributes consumed by the Classic Web Client. Combined with CVE-2026-10632 on ZCS 10.1.16, this allows an attacker to supply their own valid token and document identifiers and execute JavaScript in another user's signed-in browser session. ZCS 10.1.17 blocks that XSS chain by changing the document renderer, but retains the request attribute override.

642

External Control of Critical State Data

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Access Control Confidentiality Availability
Potential Impacts:
Bypass Protection Mechanism Gain Privileges Or Assume Identity Read Application Data Dos: Crash, Exit, Or Restart
Applicable Platforms
Technologies: Web Server
Likelihood of Exploit: High
View CWE Details
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://www.rapid7.com/blog/post/ve-breaking-zimbra-identit…
https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/