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-2026-73576
Zimbra Collaboration — In Zimbra Collaboration (ZCS) before 10.1.17, weak cryptographic key generation vulnerability exists in the OnlyOffice integration.
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L L N U N H N 6.5 .0033 24.2 —
AFFECTED
Product Versions Fixed
Collaboration unspecified —
TIMELINE
Aug 12 Reserved by mitre
Aug 13 Published (CNA: mitre)
Aug 28 RESCORED — CVE-2026-73576 (Zimbra Collaboration). CVSS 6.3 → 6.5 (NVD).
Description
In Zimbra Collaboration (ZCS) before 10.1.17, weak cryptographic key generation vulnerability exists in the OnlyOffice integration. The zimbraDocumentEditingJwtSecret is generated using an insecure random number generator, resulting in insufficient entropy. An attacker who obtains a JWT signed with the generated secret may be able to recover the JWT signing secret through offline brute-force, potentially enabling JWT forgery.
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-2026-73576 (Zimbra Collaboration). CVSS 6.3 → 6.5 (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-2026-73576 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.
