CVE-2023-26450Network attack vector

Stored XSS via missing response media type

Published Aug 2, 2023 · Updated Aug 2, 2024

Stored XSS in OX Count in Open-Xchange OX App Suite frontend 7.10.6-rev27 and earlier allows remote authenticated users to execute scripts. The service processes attacker-controlled external-resource responses without declaring an accepted media type, causing a victim's browser to interpret malicious content as executable script. Exploitation requires temporary account access or luring a user to a compromised account, enabling session hijacking or unwanted web-interface and API actions.

CVSS severity5.4
Medium
EPSS probability0.73%
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 OX Count in Open-Xchange OX App Suite frontend 7.10.6-rev27 and earlier allows remote authenticated users to execute scripts. The service processes attacker-controlled external-resource responses without declaring an accepted media type, causing a victim's browser to interpret malicious content as executable script. Exploitation requires temporary account access or luring a user to a compromised account, enabling session hijacking or unwanted web-interface and API actions.

The record

CVE
CVE-2023-26450
Published
Aug 2, 2023
Updated
Aug 2, 2024
Vendor
Open-Xchange GmbH
Product
OX App Suite
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 2, 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-rev27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open-Xchange GmbH · OX App Suiteversion=0 <=7.10.6-rev27

Published CVSS scores

5.4Open-Xchange GmbHCVSS:3.1/AV:N/AC:L/PR:L/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 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-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.

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Technologies

Your stack

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Your stack

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