CVE-2025-30191Network attack vector

User-action spoofing via unsanitized HTML attribute values

Published Oct 31, 2025 · Updated Oct 31, 2025

UI redressing in the OX App Suite backend allows remote attackers to trick users into actions or data disclosure through malicious email. The email HTML sanitizer accepts attribute values containing HTML fragments, allowing form elements to spoof trusted interface content. A recipient must render and interact with the crafted message; the resulting action or disclosure occurs with that recipient's application privileges.

CVSS severity5.4
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

UI redressing in the OX App Suite backend allows remote attackers to trick users into actions or data disclosure through malicious email. The email HTML sanitizer accepts attribute values containing HTML fragments, allowing form elements to spoof trusted interface content. A recipient must render and interact with the crafted message; the resulting action or disclosure occurs with that recipient's application privileges.

The record

CVE
CVE-2025-30191
Published
Oct 31, 2025
Updated
Oct 31, 2025
Vendor
Open-Xchange GmbH
Product
OX App Suite
Classifications
CWE-1021, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 31, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=7.6.3-rev77
  2. Affected versionversion=0 <=8.35.111
  3. Affected versionversion=0 <=8.38.82
  4. Affected versionversion=0 <=8.39.79
  5. Affected versionversion=0 <=8.40.57

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open-Xchange GmbH · OX App Suiteversion=0 <=7.6.3-rev77; version=0 <=8.35.111; version=0 <=8.38.82; version=0 <=8.39.79; version=0 <=8.40.57

Published CVSS scores

5.4Open-XchangeCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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-1021Improper Restriction of Rendered UI Layers or Frames
T1204User 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo