CVE-2023-22524Network attack vector

Remote code execution via WebSocket blocklist bypass

Published Dec 6, 2023 · Updated Feb 25, 2026

Remote code execution in Atlassian Companion before 2.0.0 allows remote attackers to execute code through WebSocket messages on macOS. The WebSocket request path fails to enforce Companion's blocklist, allowing prohibited content to bypass macOS Gatekeeper and be launched. User interaction is required, and successful exploitation runs attacker-controlled code on the client.

CVSS severity9.6

Critical

EPSS probability24.73%

Next 30 days · Sep 16, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

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Summary

What happened

The record

CVE: CVE-2023-22524
Published: Dec 6, 2023
Updated: Feb 25, 2026

Vendor: Atlassian
Product: Atlassian Companion
Classifications: T1203

Attack vector: network
Privileges: unauthenticated

Timeline

How it unfolded

Dec 6, 2023CVE publishedPublication date reported by the CVE source.
Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

Affected versionversion=>= 1.0.0
Affected versionversion=>= 1.1.0
Affected versionversion=>= 1.2.0
Affected versionversion=>= 1.2.2
Affected versionversion=>= 1.2.3
Affected versionversion=>= 1.2.4
Affected versionversion=>= 1.2.5
Affected versionversion=>= 1.2.6
Affected versionversion=>= 1.3.0
Affected versionversion=>= 1.3.1
Affected versionversion=>= 1.4.1
Affected versionversion=>= 1.4.2
Affected versionversion=>= 1.4.3
Affected versionversion=>= 1.4.4
Affected versionversion=>= 1.4.5
Affected versionversion=>= 1.4.6
Affected versionversion=>= 1.5.0
Affected versionversion=>= 1.6.0
Affected versionversion=>= 1.6.1

What conditions does exploitation require?

Attack vectornetwork

Required privilegesunauthenticated

What is affected?

Atlassian · Atlassian Companionversion=>= 1.0.0; version=>= 1.1.0; version=>= 1.2.0; version=>= 1.2.2; version=>= 1.2.3; version=>= 1.2.4; version=>= 1.2.5; version=>= 1.2.6; version=>= 1.3.0; version=>= 1.3.1; version=>= 1.4.1; version=>= 1.4.2; version=>= 1.4.3; version=>= 1.4.4; version=>= 1.4.5; version=>= 1.4.6; version=>= 1.5.0; version=>= 1.6.0; version=>= 1.6.1

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.6AtlassianCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026

Latest reporting daySep 16, 2026

Latest daily unique IPsUnavailable

Prior 30-day averageUnavailable

SourceShadowserver honeypots (KEV)

Vectornetwork

Privilegesunauthenticated

Known exploitationUnconfirmed

Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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