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Vulnerability record · CVE-2023-26428 · published 20 June 2023

CVE-2023-26428: Open-xchange appsuite backend insecure direct object reference vulnerability

Open Xchange · Open Xchange Appsuite Backend

Attackers can successfully request arbitrary snippet IDs, including E-Mail signatures of other users within the same context. Signatures of other users could be read even though they are not explicitly shared. We improved permission handling when requesting snippets that are not explicitly shared with other users. No publicly available exploits are known.

6.5 CVSS 3.1 Medium EPSS 0.98% · top 38.5% CWE-639 · Insecure direct object reference
6.5CVSS 3.1 base score
0.98%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

Attackers can successfully request arbitrary snippet IDs, including E-Mail signatures of other users within the same context. Signatures of other users could be read even though they are not explicitly shared. We improved permission handling when requesting snippets that are not explicitly shared with other users. No publicly available exploits are known.

CVSS:3.1/AV:N/AC:L/PR:L/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/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.html Third Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2023/Jun/8 Mailing ListThird Party Advisory
https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.json
https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdf Release Notes
http://packetstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.html Third Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2023/Jun/8 Mailing ListThird Party Advisory
https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.json
https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.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%7.5CVE-2023-26451Open-xchange appsuite backend vulnerabilityFunctions with insufficient randomness were used to generate authorization tokens of the integrated oAuth Authorization Service. Authorization codes …EPSS 1.2%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-2023-26431Open-xchange appsuite backend server-side request forgery (ssrf) vulnerabilityIPv4-mapped IPv6 addresses did not get recognized as "local" by the code and a connection attempt is made. Attackers with access to user accounts cou…EPSS 0.84%

Source: NIST National Vulnerability Database (record CVE-2023-26428), CISA KEV, FIRST EPSS (scores of 2026-10-14). This page is refreshed as NVD updates the record.