CVE-2024-45516Network attack vector

Session JavaScript execution via malformed image HTML

Published May 14, 2025 · Updated May 19, 2025

Stored XSS in affected Zimbra Collaboration releases allows remote attackers to execute JavaScript when a user views a crafted email. The Classic UI insufficiently sanitizes malformed img elements in email HTML, allowing embedded JavaScript event handlers to enter the rendered message. Exposure requires viewing the message in the Classic UI on 8.8.15 before Patch 47, 9.0.0 before Patch 43, 10.0.x before 10.0.12, or 10.1.x before 10.1.4; execution occurs in the user's session and can expose sensitive information.

CVSS severity6.1
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in affected Zimbra Collaboration releases allows remote attackers to execute JavaScript when a user views a crafted email. The Classic UI insufficiently sanitizes malformed img elements in email HTML, allowing embedded JavaScript event handlers to enter the rendered message. Exposure requires viewing the message in the Classic UI on 8.8.15 before Patch 47, 9.0.0 before Patch 43, 10.0.x before 10.0.12, or 10.1.x before 10.1.4; execution occurs in the user's session and can expose sensitive information.

The record

CVE
CVE-2024-45516
Published
May 14, 2025
Updated
May 19, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2025CVE publishedPublication date reported by the CVE source.
  2. May 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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