CVE•Published 2026-01-05•Modified 2026-10-07•1 article on news•5 live references•NVD data

CVE-2025-66376Synacor · Zimbra_collaboration_suite

Vulnerability data via NVD (ingested)

CVSS v3.1

7.2

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 3% of all CVEs

Weaknesses (CWE)

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Description

Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.

Timeline

Published 2026-01-05

Modified 2026-10-07

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-2025-66376

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-2025-66376