CVE-2023-26433Network attack vector

Service interruption via unbounded IMAP capabilities

Published Jun 20, 2023 · Updated Aug 2, 2024

Uncontrolled resource consumption in OX App Suite backend allows remote authenticated users to interrupt service through a rogue IMAP server. The external-mail account setup path accepts an IMAP CAPABILITY response without a plausible size limit, allowing attacker-controlled response data to consume excessive resources. Exploitation requires a signed-in user to add an account that connects to a rogue IMAP service, and the bounded consequence is backend service unavailability.

CVSS severity4.3
Medium
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in OX App Suite backend allows remote authenticated users to interrupt service through a rogue IMAP server. The external-mail account setup path accepts an IMAP CAPABILITY response without a plausible size limit, allowing attacker-controlled response data to consume excessive resources. Exploitation requires a signed-in user to add an account that connects to a rogue IMAP service, and the bounded consequence is backend service unavailability.

The record

CVE
CVE-2023-26433
Published
Jun 20, 2023
Updated
Aug 2, 2024
Vendor
Open-Xchange GmbH
Product
OX App Suite
Classifications
CWE-400, T1499.003
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

4.3Open-Xchange GmbHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

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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