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CVE-2026-50053

8.7 high SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 7

  1. StatusUndergoing Analysis → PublishedNVD modified 2026-10-28 20:02
  2. StatusPublished → Undergoing AnalysisNVD modified 2026-10-28 20:17
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-23 13:38
  4. StatusPublished → Awaiting AnalysisNVD modified 2026-10-23 16:44
  5. StatusReceived → PublishedNVD modified 2026-10-23 13:38
  6. StatusPublished → ReceivedNVD modified 2026-10-23 14:17
  7. First seenCVSS 8.7 · zimbraNVD modified 2026-10-23 13:38

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 2