CVE-2025-30090Network attack vector

Stored script execution via partially decoded headers

Published Apr 2, 2025 · Updated Apr 2, 2025

Cross-site scripting in SquirrelMail 1.4.23-svn-20250401 and earlier and 1.5.x through 1.5.2-svn-20250401 allows remote attackers to run script. In functions/mime.php, header decoding leaves a later unencoded segment unsanitized after an earlier encoded segment sets $encoded to true. A crafted incoming message reaches both message-list and message-display rendering, so opening the mailbox executes the payload in the user's browser.

CVSS severity7.2
High
EPSS probability0.26%
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 SquirrelMail 1.4.23-svn-20250401 and earlier and 1.5.x through 1.5.2-svn-20250401 allows remote attackers to run script. In functions/mime.php, header decoding leaves a later unencoded segment unsanitized after an earlier encoded segment sets $encoded to true. A crafted incoming message reaches both message-list and message-display rendering, so opening the mailbox executes the payload in the user's browser.

The record

CVE
CVE-2025-30090
Published
Apr 2, 2025
Updated
Apr 2, 2025
Vendor
SquirrelMail Project
Product
SquirrelMail
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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 <=1.4.23-svn-20250401
  2. Affected versionversion=1.5 <=1.5.2-svn-20250401

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SquirrelMail Project · SquirrelMailversion=0 <=1.4.23-svn-20250401; version=1.5 <=1.5.2-svn-20250401

Published CVSS scores

7.2GitHub Advisory DatabaseCVSS: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 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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