CVE-2018-25269Public exploitNetwork attack vector

Session compromise via executable email data URIs

Published Apr 22, 2026 · Updated Apr 22, 2026

Cross-site scripting in IceWarp Desktop Client 10.3.4 and 11.0.0.0 allows remote attackers to run script when a crafted email is viewed. The email renderer accepts object and embed elements whose base64-encoded data URIs decode to executable HTML or SVG script instead of neutralizing them. Delivery is remote and unauthenticated, but execution requires a recipient to view the message; the script runs in the client session and can access session data or act with that session.

CVSS severity5.1
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in IceWarp Desktop Client 10.3.4 and 11.0.0.0 allows remote attackers to run script when a crafted email is viewed. The email renderer accepts object and embed elements whose base64-encoded data URIs decode to executable HTML or SVG script instead of neutralizing them. Delivery is remote and unauthenticated, but execution requires a recipient to view the message; the script runs in the client session and can access session data or act with that session.

The record

CVE
CVE-2018-25269
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
IceWarp
Product
IceWarp Desktop Client
Classifications
CWE-79, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.3.4
  2. Affected versionversion=11.0.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IceWarp · IceWarp Desktop Clientversion=10.3.4; version=11.0.0.0

Published CVSS scores

6.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204User Execution

Public exploit references

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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