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Vulnerability record · CVE-2023-26451 · published 2 August 2023

CVE-2023-26451: Open-xchange appsuite backend vulnerability

Open Xchange · Open Xchange Appsuite Backend

Functions with insufficient randomness were used to generate authorization tokens of the integrated oAuth Authorization Service. Authorization codes were predictable for third parties and could be used to intercept and take over the client authorization process. As a result, other users accounts could be compromised. The oAuth Authorization Service is not enabled by default. We have updated the implementation to use sources with sufficient randomness to generate authorization tokens. No publicly available exploits are known.

7.5 CVSS 3.1 High EPSS 1.2% · top 32.8% CWE-330 · CWE-330
7.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

Functions with insufficient randomness were used to generate authorization tokens of the integrated oAuth Authorization Service. Authorization codes were predictable for third parties and could be used to intercept and take over the client authorization process. As a result, other users accounts could be compromised. The oAuth Authorization Service is not enabled by default. We have updated the implementation to use sources with sufficient randomness to generate authorization tokens. No publicly available exploits are known.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/173943/OX-App-Suite-SSRF-SQL-Injection-Cross-Site-Scripting.html Third Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2023/Aug/8 Mailing ListThird Party Advisory
https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0003.json
https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6230_7.10.6_2023-05-02.pdf Release Notes
http://packetstormsecurity.com/files/173943/OX-App-Suite-SSRF-SQL-Injection-Cross-Site-Scripting.html Third Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2023/Aug/8 Mailing ListThird Party Advisory
https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0003.json
https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6230_7.10.6_2023-05-02.pdf Release Notes

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-26443Open-xchange appsuite backend sql injection vulnerabilityFull-text autocomplete search allows user-provided SQL syntax to be injected to SQL statements. With existing sanitization in place, this can be abus…EPSS 0.82%8.8CVE-2023-26436Open-xchange appsuite backend code injection vulnerabilityAttackers with access to the "documentconverterws" API were able to inject serialized Java objects, that were not properly checked during deserializa…EPSS 1.3%6.5CVE-2023-26428Open-xchange appsuite backend insecure direct object reference vulnerabilityAttackers can successfully request arbitrary snippet IDs, including E-Mail signatures of other users within the same context. Signatures of other use…EPSS 0.98%6.1CVE-2016-6846Open-xchange documentconverter-api cross-site scripting vulnerabilityCross-site scripting (XSS) vulnerability in Open-Xchange (OX) AppSuite backend before 7.6.2-rev59, 7.8.0 before 7.8.0-rev38, 7.8.2 before 7.8.2-rev8;…EPSS 1.2%5.3CVE-2023-26429Open-xchange appsuite backend command injection vulnerabilityControl characters were not removed when exporting user feedback content. This allowed attackers to include unexpected content via user feedback and …EPSS 0.79%5.0CVE-2023-26435Open-xchange appsuite backend server-side request forgery (ssrf) vulnerabilityIt was possible to call filesystem and network references using the local LibreOffice instance using manipulated ODT documents. Attackers could disco…EPSS 0.78%4.3CVE-2023-26430Open-xchange appsuite backend command injection vulnerabilityAttackers with access to user accounts can inject arbitrary control characters to SIEVE mail-filter rules. This could be abused to access SIEVE exten…EPSS 0.75%4.3CVE-2023-26434Open-xchange appsuite backend uncontrolled resource consumption vulnerabilityWhen adding an external mail account, processing of POP3 "capabilities" responses are not limited to plausible sizes. Attacker with access to a rogue…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2023-26451), CISA KEV, FIRST EPSS (scores of 2026-10-12). This page is refreshed as NVD updates the record.