CISA KEV entry
CVE-2025-48700Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
Synacor Zimbra Collaboration Suite (ZCS). Added to the CISA Known Exploited Vulnerabilities catalogue on 20 April 2026.
Data status: a source is stale
Last synced CISA catalogue version 2026.11.04 (released 4 November 2026) 1,768 entries Updated manually
- Date added
- 2026-04-20
- Federal due date
- 2026-04-23 3 days after it was added; passed at the sync of 2026-11-05
- Known ransomware use
- Unknown
- Forensic triage (BOD 26-04)
- No
- CVSS
- 6.1 Medium CVSS 3.1, scored by CISA ADP
- EPSS
- 1.71% percentile 77.4, scored 2026-11-04
- CISA SSVC
- Exploitation active, automatable no, technical impact partial
- NVD status
- Analyzed published 2025-06-23, 301 days before the KEV listing
BOD 26-04 remediation window
With CISA's SSVC answers for this CVE (automatable: no, technical impact: partial), BOD 26-04 Table 1 gives 14 days on a publicly exposed asset (row 4) and 14 days on an asset that is not publicly exposed (row 12) S06. The catalogue due date, 3 days after the date added, was set before BOD 26-04 took effect on 10 June 2026 S06. The directive binds US federal civilian executive branch agencies only.
What CISA says
Short description
Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that could allow attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-48700
CWE in the catalogue
CWE-79
Official links
- CISA KEV catalogue entry cisa.gov
- NVD record nvd.nist.gov
Vendor advisory and patch links
References NVD tags Vendor Advisory or Patch, exactly as NVD lists them.
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories Vendor Advisory
Links in CISA's notes
NVD details
- CWE (NVD)
- CWE-79 by CISA ADP
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- CVSS versions in NVD
- V31
- Last modified in NVD
- 2026-06-17T09:30:11.837
Where each value comes from
| Field | Source | Fetched, UTC | State |
|---|---|---|---|
| Catalogue fields | CISA KEV JSON, version 2026.11.04 | 2026-11-05 11:38 | current |
| NVD published, status, CVSS, CWE, vendor links | NVD CVE API 2.0; CVSS: NVD (CISA ADP) | 2026-11-03 12:37 | current at 2026-11-05 11:38 |
| EPSS | FIRST EPSS API, scores of 2026-11-04 | 2026-11-05 11:38 | current |
| CISA SSVC | CISA ADP (via NVD), record of 2026-04-20 | 2026-11-03 12:37 | current |
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