CVE-2025-59025Network attack vector

Account-context script execution via CSS sanitizer bypass

Published Nov 27, 2025 · Updated Dec 1, 2025

Stored XSS in affected OX App Suite backend releases allows remote attackers to execute scripts through malicious email content. The email sanitizer fails to neutralize crafted CSS elements before rendered message content reaches the web interface. A recipient must view the message; the script runs in that user's account context and can perform unintended actions or exfiltrate sensitive information.

CVSS severity6.1
Medium
EPSS probability0.20%
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 OX App Suite backend releases allows remote attackers to execute scripts through malicious email content. The email sanitizer fails to neutralize crafted CSS elements before rendered message content reaches the web interface. A recipient must view the message; the script runs in that user's account context and can perform unintended actions or exfiltrate sensitive information.

The record

CVE
CVE-2025-59025
Published
Nov 27, 2025
Updated
Dec 1, 2025
Vendor
Open-Xchange GmbH
Product
OX App Suite
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 1, 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 <=8.35.110
  2. Affected versionversion=0 <=8.39.85
  3. Affected versionversion=0 <=8.40.73
  4. Affected versionversion=0 <=8.41.50

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open-Xchange GmbH · OX App Suiteversion=0 <=8.35.110; version=0 <=8.39.85; version=0 <=8.40.73; version=0 <=8.41.50

Published CVSS scores

6.1Open-Xchange GmbHCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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