CVE-2026-50053Zimbra Collaboration Suite RestFilter Request Attribute Override via Unauthenticated URL Parameters
Updated under an hour ago ()
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It affects Zimbra Collaboration Suite. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.30%, higher than 23% of scored CVEs.
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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.
- CVSS
- 8.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- Weakness (CWE)
- CWE-642
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.30% (percentile 23)
- Assigned by
- rapid7
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 23, 2026
- First seen by InfoSec Signals
- Oct 23, 2026
The CVE record on cve.org NVD's entry
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