CVE-2023-40266: An issue was discovered in Atos Unify OpenScape Xpressions WebAssistant V7 before V7R1 FR5 HF42 P911

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CRITICAL 9.8REMOTEUPGRADE

CVE-2023-40266 is a critical-severity flaw (CVSS 9.8) affecting unify openscape xpressions webassistant. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-22
Published	2024-02-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mitel

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-02-08 22:15 UTCPublished CVE record published
2026-06-17 06:16 UTCUpdated Record last modified

mitel unify openscape xpressions webassistant UPGRADE

Affected: >= 7.0 and < 7r1_fr5_hf42_p911

Fixed in: 7r1_fr5_hf42_p911

Safe to downgrade to: a release before 7.0

1. Check installed version

apt-cache policy unify-openscape-xpressions-webassistant || rpm -q unify-openscape-xpressions-webassistant || unify-openscape-xpressions-webassistant --version

2. UPGRADE to 7r1_fr5_hf42_p911 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unify-openscape-xpressions-webassistant

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unify-openscape-xpressions-webassistant

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.0 (Debian / Ubuntu)

apt-cache madison unify-openscape-xpressions-webassistant sudo apt install unify-openscape-xpressions-webassistant=<VERSION_BEFORE_7.0> sudo apt-mark hold unify-openscape-xpressions-webassistant

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list unify-openscape-xpressions-webassistant sudo dnf downgrade unify-openscape-xpressions-webassistant-<VERSION_BEFORE_7.0> sudo dnf versionlock add unify-openscape-xpressions-webassistant

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-40266?

unify openscape xpressions webassistant: upgrade to 7r1_fr5_hf42_p911. Exact commands for each OS are on this page.

Is CVE-2023-40266 being exploited?

CVE-2023-40266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-40266 affect?

CVE-2023-40266 affects unify openscape xpressions webassistant. Severity is critical (CVSS 9.8). An issue was discovered in Atos Unify OpenScape Xpressions WebAssistant V7 before V7R1 FR5 HF42 P911. It allows path traversal.

How urgent is CVE-2023-40266?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-40265 HIGH 8.8 UPGRADE An issue was discovered in Atos Unify OpenScape Xpressions WebAssistant V7 before V7R1 FR5 HF42 P911

References

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