Attackers can successfully request arbitrary snippet IDs, including E-Mail signatures of other users within the same context.

published 2023-06-20 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-30248

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

open-xchange open-xchange_appsuite_backend 7.10.6, 8.11.0

Exploit prediction

0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

OX Software GmbH OX App Suite

Classification

Weakness

CWE-639 Authorization Bypass Through User-Controlled Key

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-2023-26428
NVD CVE-2023-26428

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