Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-73571
Zimbra Collaboration — An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper authorization validation in del…
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L L N U N L N 4.3 .0026 15.9 —
AFFECTED
Product Versions Fixed
Collaboration unspecified —
TIMELINE
Aug 12 Reserved by mitre
Aug 13 Published (CNA: mitre)
Aug 28 RESCORED — CVE-2026-73571 (Zimbra Collaboration). CVSS 3.1 → 4.3 (NVD).
Description
An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper authorization validation in delegated email sending functionality. An authenticated attacker can send specially crafted SOAP requests to impersonate another user and send emails without possessing the required delegation or send-as permissions. This occurs in the SaveDraftRequest SOAP handler.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| August 12, 2026 | Reserved | Reserved by mitre |
| August 13, 2026 | Published | Published (CNA: mitre) |
| August 28, 2026 | RESCORED | RESCORED — CVE-2026-73571 (Zimbra Collaboration). CVSS 3.1 → 4.3 (NVD). |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Zimbra | Collaboration | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-73571 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
