CVE-2023-26438

lowpriority · track · 12EPSS 0.006 · 49 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.60% (49th) EPSS

CVSS 3.1 · low

Is it mine?

4 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

External service lookups for a number of protocols were vulnerable to a time-of-check/time-of-use (TOCTOU) weakness, involving the JDK DNS cache. Attackers that were timing DNS cache expiry correctly were able to inject configuration that would bypass existing network deny-lists. Attackers could exploit this weakness to discover the existence of restricted network infrastructure and service availability. Improvements were made to include deny-lists not only during the check of the provided connection data, but also during use. No publicly available exploits are known.

cvss

Technical severity, 0–10. One row per scoring source.

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.9–4.3

v3.13.1lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 1.6 · impact 1.4

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · security@open-xchange.comexploitability 2.8 · impact 1.4

v3.12.9lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-367USprimaryCWE-918USprimary

affected products (4)

Products and version ranges known to be affected.

OX Software GmbH OX App Suite≤ 0 ≤7.10.6-rev42enisa_euvdEU
OX Software GmbH OX App Suite≤ 0 ≤8.10enisa_euvdEU
open-xchange open-xchange appsuite backend= 7.10.6nvdUScpe:2.3:a:open-xchange:open-xchange_appsuite_backend:*:*:*:*:*:*:*:*
open-xchange open-xchange appsuite backend= 8.10.0nvdUScpe:2.3:a:open-xchange:open-xchange_appsuite_backend:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2023-08-02modified 2026-06-17

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references (15)

External citations — patches, advisories, analysis.

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