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Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability

CVE-2025-48700

What this means

This is rated medium severity (6.1 out of 10). It is on the known-exploited catalogue, which means attacks using it have already been seen. Ask IT whether Synacor Zimbra Collaboration Suite is in your estate.

Full vendor description

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 tag structures and attribute values that include an @import directive and other script injection vectors. The vulnerability is triggered when a user views a crafted e-mail message in the Classic UI, requiring no additional user interaction.

Scoring and exploitation

6.1/ 10
CVSS 3.1 base scoreMedium

Exploitable over the network without any account, but only if a user takes an action, such as opening a file or link. Low impact on confidentiality and integrity, and it can reach beyond the vulnerable system.

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

Exploitability

Longer bar: easier to attack

Attack vectorNetworkAV:N
Attack complexityLowAC:L
Privileges requiredNonePR:N
User interactionRequiredUI:R
ScopeChangedS:C

Impact

Longer bar: more harm

ConfidentialityLowC:L
IntegrityLowI:L
AvailabilityNoneA:N
~1.7% estimated chance of attack in 30 daysModel estimate (): a probability signal, not confirmed exploitation
Exploited in the wild
Yes — confirmed exploitation (US CISA )
Not reported
Listed product
Synacor Zimbra Collaboration Suite (ZCS)

Weaknesses

CWE-79

Affected products ()

  • Synacor Zimbra Collaboration Suite
Show the raw CPE strings (40)
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:-:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p1:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p10:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p11:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p12:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p13:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p14:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p15:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p16:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p17:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p18:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p19:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p2:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p20:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p21:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p22:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p23:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p24:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p25:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p26:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p27:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p28:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p29:*:*:*:*:*:*
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p3:*:*:*:*:*:*

Showing 25 of 40 matches from .

References

4 links from the CVE record, grouped by site; the vendor's advisory comes first.

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