Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2025-66376

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6b79af16c2f39e8b085e97030051da03ad5929265b9875eeab5cd1dadcea0c86
Known exploited
CISA KEV
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Collaboration","vendor":"Zimbra","versions":[{"lessThan":"10.0.18","status":"affected","version":"10.0","versionType":"custom"},{"lessThan":"10.1.13","status":"affected","version":"10.1","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9548e323852cfc8298e2c0014a7470347aa23509758badb846b8b6c5dd27c56b · sha256:896726fc815f363c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":7.2,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9548e323852cfc8298e2c0014a7470347aa23509758badb846b8b6c5dd27c56b · sha256:896726fc815f363c… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9548e323852cfc8298e2c0014a7470347aa23509758badb846b8b6c5dd27c56b · sha256:896726fc815f363c… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"cwes":["CWE-79"],"dateAdded":"2026-03-18","dueDate":"2026-04-01","knownRansomwareCampaignUse":"Unknown","notes":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-66376","product":"Zimbra Collaboration Suite (ZCS)","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability in the Classic UI where attackers could a…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:334bce93639afbd75a807c2dc56d00a45a387dcb59ee5dc07b768f2486fccac4 · sha256:635dff916c4092c0… · /vulnerabilities/115
    Open source location →
{"cwes":["CWE-79"],"dateAdded":"2026-03-18","dueDate":"2026-04-01","knownRansomwareCampaignUse":"Unknown","notes":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-66376","product":"Zimbra Collaboration Suite (ZCS)","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability in the Classic UI where attackers could a…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:d1505599e150211d53f08c13f39679ce6ec32ab8731e7b5a2a6f760fc03f6f8d · sha256:16acee8334e59e44… · /vulnerabilities/112
    Open source location →

Source references

6 source assertions
{"url":"https://wiki.zimbra.com/wiki/Security_Center"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9548e323852cfc8298e2c0014a7470347aa23509758badb846b8b6c5dd27c56b · sha256:896726fc815f363c… · /containers/cna/references/1
{"url":"https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9548e323852cfc8298e2c0014a7470347aa23509758badb846b8b6c5dd27c56b · sha256:896726fc815f363c… · /containers/cna/references/4
{"url":"https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9548e323852cfc8298e2c0014a7470347aa23509758badb846b8b6c5dd27c56b · sha256:896726fc815f363c… · /containers/cna/references/3
{"url":"https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9548e323852cfc8298e2c0014a7470347aa23509758badb846b8b6c5dd27c56b · sha256:896726fc815f363c… · /containers/cna/references/2
{"url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9548e323852cfc8298e2c0014a7470347aa23509758badb846b8b6c5dd27c56b · sha256:896726fc815f363c… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9548e323852cfc8298e2c0014a7470347aa23509758badb846b8b6c5dd27c56b · sha256:896726fc815f363c… · /containers/adp/0/references/0

Attribution and limitations

  • CISA Known Exploited Vulnerabilities JSON: CISA named for provenance; do not use CISA/DHS marks or imply endorsement Source →
  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

← Back to CVE Explorer