IPv4-mapped IPv6 addresses did not get recognized as "local" by the code and a connection attempt is made.

published 2023-06-20 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-30251

cvss: 5.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

open-xchange open-xchange_appsuite_backend 7.10.6, 8.11.0

Exploit prediction

0.84% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.0	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

OX Software GmbH OX App Suite

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

documentation.open-xchange.com /appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.json
vendor-advisory
software.open-xchange.com /products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdf
release-notes
seclists.org /fulldisclosure/2023/Jun/8
mailing-list, third-party-advisory
packetstormsecurity.com /files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.html
third-party-advisory, vdb-entry

Sources

CVE List CVE-2023-26431
NVD CVE-2023-26431

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary