CVE•Published 2026-08-13•Modified 2026-08-28•0 articles on news•5 live references•NVD data

CVE-2026-73576Synacor · Zimbra_collaboration_suite

Vulnerability data via NVD (ingested)

CVSS v3.1

6.3

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

EPSS percentile

Exploit Prediction Scoring System · top 91% of all CVEs

Weaknesses (CWE)

CWE-1241Use of Predictable Algorithm in Random Number Generator

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.

Timeline

Published 2026-08-13

Modified 2026-08-28

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-73576

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Synacor Zimbra Collaboration Suite"

All exposed Synacor Zimbra Collaboration Suite instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Zimbra Collaboration Suite"

HTTP body or banner mentions "Zimbra Collaboration Suite" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-73576