CVE-2023-26431Network attack vector

Authenticated SSRF via IPv4-mapped IPv6 deny-list bypass

Published Jun 20, 2023 · Updated Aug 2, 2024

SSRF in OX App Suite backend 7.10.6-rev39 and 8.10 allows remote authenticated users to probe restricted network services. The local-address deny-list check fails to normalize IPv4-mapped IPv6 destinations, then permits the backend to connect to the embedded IPv4 address. A valid user account is required; successful requests expose network topology and listening services.

CVSS severity5.0
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in OX App Suite backend 7.10.6-rev39 and 8.10 allows remote authenticated users to probe restricted network services. The local-address deny-list check fails to normalize IPv4-mapped IPv6 destinations, then permits the backend to connect to the embedded IPv4 address. A valid user account is required; successful requests expose network topology and listening services.

The record

CVE
CVE-2023-26431
Published
Jun 20, 2023
Updated
Aug 2, 2024
Vendor
Open-Xchange GmbH
Product
OX App Suite
Classifications
CWE-918, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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 <=7.10.6-rev39
  2. Affected versionversion=0 <=8.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open-Xchange GmbH · OX App Suiteversion=0 <=7.10.6-rev39; version=0 <=8.10

Published CVSS scores

5.0Open-Xchange GmbHCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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