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TI-2025-20638 Aliases CVE-2025-27914GHSA-xr5m-494h-32gf

An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0 and 10.1.

Priority LOW 24CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0 and 10.1. A Reflected Cross-Site Scripting (XSS) vulnerability exists in the /h/rest endpoint, allowing authenticated attackers to inject and execute arbitrary JavaScript in a victim's session. Exploitation requires a valid auth token and involves a crafted URL with manipulated query parameters that triggers XSS when accessed by a victim.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00283 20th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*10.0.0 to before 10.0.11VulnerableZimbra
cpe:2.3:a:zimbra:collaboration:9.0.0:-:*:*:*:*:*:*9.0.0VulnerableZimbra
cpe:2.3:a:zimbra:collaboration:10.1.0:*:*:*:*:*:*:*10.1.0VulnerableZimbra
  • cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:* Versions 10.0.0 to before 10.0.11 Vulnerable ·Zimbra
  • cpe:2.3:a:zimbra:collaboration:9.0.0:-:*:*:*:*:*:* Versions 9.0.0 Vulnerable ·Zimbra
  • cpe:2.3:a:zimbra:collaboration:10.1.0:*:*:*:*:*:*:* Versions 10.1.0 Vulnerable ·Zimbra

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-27914
  2. 2026-10-03 Alias added: GHSA-xr5m-494h-32gf

References

Other 2

  • TI-2024-18266 An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0. KEVCVSS 3.1MEDIUM 6.1
  • TI-2024-30553 An issue was discovered in Zimbra Collaboration (ZCS) 10.1.x before 10.1.1, 10.0.x before… CVSS 3.1HIGH 8.8
  • TI-2022-13998 Zimbra Collaboration Open Source 8.8.15 does not encrypt the initial-login randomly… CVSS 3.1CRITICAL 9.8
  • TI-2023-13772 An issue in Zimbra Collaboration ZCS v.8.8.15 and v.9.0 allows an attacker to execute… CVSS 3.1CRITICAL 9.8
  • TI-2023-13771 An issue in Zimbra Collaboration (ZCS) v.8.8.15 and v.9.0 allows a remote attacker to… CVSS 3.1CRITICAL 9.8
  • TI-2023-27722 Zimbra Collaboration before Kepler 9.0.0 Patch 38 GA allows DOM-based JavaScript injection in the Modern UI. CVSS 3.1CRITICAL 9.1
See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences