UpHeron
All vulnerabilities

Servers and applications

CVE-2025-48700

An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0 and 10.0 and 10.1. A Cross-Site Scripting (XSS) vulnerability in the Zimbra Classic UI allows attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information. This issue arises from insufficient sanitization of HTML content, specifically involving crafted…

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 20 Apr 2026.

Severity
Medium 6.1
Published
23 Jun 2025
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
10.0.12, 10.1.4
Sources
NVD

Affected software

SoftwareAffected versions
Zimbra CollaborationServers and applications · cpe:a:synacor:zimbra_collaboration_suite
  • From 10.1.0 before 10.1.4
  • From 10.0.0 before 10.0.12
  • Version 9.0.0-p42
  • Version 9.0.0-p41
All 94 release lines
  • Version 8.8.15
  • Version 8.8.15-p1
  • Version 8.8.15-p2
  • Version 8.8.15-p3
  • Version 8.8.15-p4
  • Version 8.8.15-p5
  • Version 8.8.15-p6
  • Version 8.8.15-p7
  • Version 8.8.15-p8
  • Version 8.8.15-p9
  • Version 8.8.15-p10
  • Version 8.8.15-p11
  • Version 8.8.15-p12
  • Version 8.8.15-p13
  • Version 8.8.15-p14
  • Version 8.8.15-p15
  • Version 8.8.15-p16
  • Version 8.8.15-p17
  • Version 8.8.15-p18
  • Version 8.8.15-p19
  • Version 8.8.15-p20
  • Version 8.8.15-p21
  • Version 8.8.15-p22
  • Version 8.8.15-p23
  • Version 8.8.15-p24
  • Version 8.8.15-p25
  • Version 8.8.15-p26
  • Version 8.8.15-p27
  • Version 8.8.15-p28
  • Version 8.8.15-p29
  • Version 8.8.15-p30
  • Version 8.8.15-p31
  • Version 8.8.15-p31.1
  • Version 8.8.15-p32
  • Version 8.8.15-p33
  • Version 8.8.15-p34
  • Version 8.8.15-p35
  • Version 8.8.15-p36
  • Version 8.8.15-p37
  • Version 8.8.15-p38
  • Version 8.8.15-p39
  • Version 8.8.15-p40
  • Version 8.8.15-p41
  • Version 8.8.15-p42
  • Version 8.8.15-p43
  • Version 8.8.15-p44
  • Version 8.8.15-p45
  • Version 8.8.15-p46
  • Version 9.0.0
  • Version 9.0.0-p1
  • Version 9.0.0-p2
  • Version 9.0.0-p3
  • Version 9.0.0-p4
  • Version 9.0.0-p5
  • Version 9.0.0-p6
  • Version 9.0.0-p7
  • Version 9.0.0-p8
  • Version 9.0.0-p9
  • Version 9.0.0-p10
  • Version 9.0.0-p11
  • Version 9.0.0-p12
  • Version 9.0.0-p13
  • Version 9.0.0-p14
  • Version 9.0.0-p15
  • Version 9.0.0-p16
  • Version 9.0.0-p17
  • Version 9.0.0-p18
  • Version 9.0.0-p19
  • Version 9.0.0-p20
  • Version 9.0.0-p21
  • Version 9.0.0-p22
  • Version 9.0.0-p23
  • Version 9.0.0-p24
  • Version 9.0.0-p24.1
  • Version 9.0.0-p25
  • Version 9.0.0-p26
  • Version 9.0.0-p27
  • Version 9.0.0-p28
  • Version 9.0.0-p29
  • Version 9.0.0-p30
  • Version 9.0.0-p31
  • Version 9.0.0-p32
  • Version 9.0.0-p33
  • Version 9.0.0-p34
  • Version 9.0.0-p35
  • Version 9.0.0-p36
  • Version 9.0.0-p37
  • Version 9.0.0-p38
  • Version 9.0.0-p39
  • Version 9.0.0-p40
  • Version 9.0.0-p41
  • Version 9.0.0-p42
  • From 10.0.0 before 10.0.12
  • From 10.1.0 before 10.1.4

Known exploited

CISA name
Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
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.
Due for US agencies
23 Apr 2026
Used in ransomware
Not known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-48700
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-48700