CVE-2025-30349Known exploitationPublic exploitNetwork attack vector

Account takeover via unsanitized email event handlers

Published Mar 21, 2025 · Updated Apr 3, 2025

Cross-site scripting in Horde IMP 6.2.27 and earlier allows remote attackers to take over accounts via crafted HTML email. Its server-side HTML filtering leaves an onerror handler containing encoded or base64-obfuscated JavaScript intact, which the browser decodes and executes. The payload runs when a recipient views the message in the Horde web client, requiring no click, and can expose credentials and mailbox data.

CVSS severity7.2
High
EPSS probability31.29%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Horde IMP 6.2.27 and earlier allows remote attackers to take over accounts via crafted HTML email. Its server-side HTML filtering leaves an onerror handler containing encoded or base64-obfuscated JavaScript intact, which the browser decodes and executes. The payload runs when a recipient views the message in the Horde web client, requiring no click, and can expose credentials and mailbox data.

The record

CVE
CVE-2025-30349
Published
Mar 21, 2025
Updated
Apr 3, 2025
Vendor
Horde
Product
IMP
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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?

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

  1. Affected versionversion=0 <=6.2.27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Horde · IMPversion=0 <=6.2.27

Published CVSS scores

7.2MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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