CVE-2023-4509Network attack vector

API key disclosure via unredacted audit logging

Published Apr 17, 2024 · Updated Nov 7, 2024

Information exposure in Octopus Server allows remote authenticated users with audit-log access to obtain a cleartext API key. After an invalid login attempt, the server writes the supplied API key into the audit log instead of redacting the credential. Exploitation requires an API key and EventView access to the resulting audit entry; disclosure exposes that credential for reuse.

CVSS severity4.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Octopus Server allows remote authenticated users with audit-log access to obtain a cleartext API key. After an invalid login attempt, the server writes the supplied API key into the audit log instead of redacting the credential. Exploitation requires an API key and EventView access to the resulting audit entry; disclosure exposes that credential for reuse.

The record

CVE
CVE-2023-4509
Published
Apr 17, 2024
Updated
Nov 7, 2024
Vendor
Octopus Deploy
Product
Octopus Server
Classifications
CWE-319, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=2018.9 <2023.4.296
  2. Affected versionversion=2024.1 <2024.1.437
  3. Affected versionversion=2024.2 <2024.2.101

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Octopus Deploy · Octopus Serverversion=2018.9 <2023.4.296; version=2024.1 <2024.1.437; version=2024.2 <2024.2.101

Published CVSS scores

4.3Octopus DeployCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1552.001Unsecured Credentials: Credentials In Files

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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