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Vulnerability record · CVE-2023-26431 · published 20 June 2023

CVE-2023-26431: Open-xchange appsuite backend server-side request forgery (ssrf) vulnerability

Open Xchange · Open Xchange Appsuite Backend

IPv4-mapped IPv6 addresses did not get recognized as "local" by the code and a connection attempt is made. Attackers with access to user accounts could use this to bypass existing deny-list functionality and trigger requests to restricted network infrastructure to gain insight about topology and running services. We now respect possible IPV4-mapped IPv6 addresses when checking if contained in a deny-list. No publicly available exploits are known.

4.3 CVSS 3.1 Medium EPSS 0.84% · top 43.0% CWE-918 · Server-side request forgery (SSRF)
4.3CVSS 3.1 base score
0.84%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

IPv4-mapped IPv6 addresses did not get recognized as "local" by the code and a connection attempt is made. Attackers with access to user accounts could use this to bypass existing deny-list functionality and trigger requests to restricted network infrastructure to gain insight about topology and running services. We now respect possible IPV4-mapped IPv6 addresses when checking if contained in a deny-list. No publicly available exploits are known.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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%6.5CVE-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%

Source: NIST National Vulnerability Database (record CVE-2023-26431), CISA KEV, FIRST EPSS (scores of 2026-10-15). This page is refreshed as NVD updates the record.