How severe is CVE-2023-40266?

CVE-2023-40266 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-40266 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40266?

CVE-2023-40266 affects Mitel Unify Openscape Xpressions Webassistant. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40266?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2023-40266 have an EU (EUVD) identifier?

Yes. CVE-2023-40266 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-44863.

When was CVE-2023-40266 published?

CVE-2023-40266 was published on 2024-02-08 and last updated on 2026-06-17.

CVE-2023-40266

CVE-2023-40266 is a critical-severity vulnerability in Mitel Unify Openscape Xpressions Webassistant with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-44863
Weakness: CWE-22
Affected product: Mitel Unify Openscape Xpressions Webassistant
Published: 2024-02-08
Last modified: 2026-06-17

Description

An issue was discovered in Atos Unify OpenScape Xpressions WebAssistant V7 before V7R1 FR5 HF42 P911. It allows path traversal.

Frequently asked questions

What is CVE-2023-40266?: An issue was discovered in Atos Unify OpenScape Xpressions WebAssistant V7 before V7R1 FR5 HF42 P911. It allows path traversal.
How severe is CVE-2023-40266?: CVE-2023-40266 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-40266 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40266?: CVE-2023-40266 affects Mitel Unify Openscape Xpressions Webassistant. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40266?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2023-40266 have an EU (EUVD) identifier?: Yes. CVE-2023-40266 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-44863.
When was CVE-2023-40266 published?: CVE-2023-40266 was published on 2024-02-08 and last updated on 2026-06-17.

References

https://networks.unify.com/security/advisories/OBSO-2305-03.pdf

Affected products (1)

cpe:2.3:a:mitel:unify_openscape_xpressions_webassistant:*:*:*:*:*:*:*:*

More vulnerabilities in Mitel Unify Openscape Xpressions Webassistant

CVE-2023-40265 — High (CVSS 8.8): An issue was discovered in Atos Unify OpenScape Xpressions WebAssistant V7 before V7R1 FR5 HF42 P911. It allows…

All CVEs affecting Mitel Unify Openscape Xpressions Webassistant →

Other CWE-22 (Path Traversal) vulnerabilities

CVE-2026-76606 — Critical (CVSS 10.0): Joomla Extension - fabrikar.com - Path Traversal via image element in Fabrik < 4.7.3 - ???.
CVE-2026-18051 — Critical (CVSS 10.0): The W3 Total Cache WordPress plugin before 2.10.5 does not properly validate the request path it uses to build cache…
CVE-2026-74764 — Critical (CVSS 10.0): Pandora contains a path traversal vulnerability in its TAR archive extraction functionality. When processing a…
CVE-2026-16940 — Critical (CVSS 10.0): The Custom Fields WordPress plugin before 1.5.1 does not validate a user-supplied file path before deletion, allowing…
CVE-2026-67429 — Critical (CVSS 10.0): Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.6, image.download and related…
CVE-2026-59555 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Deletion in Participants Database <= 2.7.8.3 versions.

Browse all CWE-22 (Path Traversal) vulnerabilities →