CVE-2025-66376

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2026-03-18. Federal remediation due 2026-04-01.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

19.56% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 97.2% of scored records. A rank, not a probability.

NVD base score

6.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-01-05 00:00Z8 MO AGO

Last updated

2026-03-19 03:55Z5 MO AGO

Reserved

2025-11-28

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.2)

CNA CVSS vector

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

Weaknesses

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

Data version

5.2

Document digest

896726fc815f363cd0679c60732bcae9b573646f3f9f4350cd70526e7ab5f4d7

• wiki.zimbra.comhttps://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
• wiki.zimbra.comhttps://wiki.zimbra.com/wiki/Security_Center
• wiki.zimbra.comhttps://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
• wiki.zimbra.comhttps://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes
• wiki.zimbra.comhttps://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376government-resource