CVE-2026-91778Network attack vectorHinoki check available

Authenticated script execution via incorrect permission validation

Published Sep 15, 2026 · Updated Sep 15, 2026

Incorrect authorization in Octopus Server allows remote authenticated users to execute arbitrary scripts on configured workers. The script-execution permission validator accepts certain scoped permission sets without verifying the authorization required to run the requested script. Reachability requires an authenticated account with one of those scoped permission sets; code runs on the chosen worker, including the built-in server worker.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect authorization in Octopus Server allows remote authenticated users to execute arbitrary scripts on configured workers. The script-execution permission validator accepts certain scoped permission sets without verifying the authorization required to run the requested script. Reachability requires an authenticated account with one of those scoped permission sets; code runs on the chosen worker, including the built-in server worker.

The record

CVE
CVE-2026-91778
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Octopus Deploy
Product
Octopus Server
Classifications
T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record 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=2019.0.0 <2026.1.11725
  2. Affected versionversion=2026.2.0 <2026.2.13344
  3. Affected versionversion=2026.3.0 <2026.3.11816

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Octopus Deploy · Octopus Serverversion=2019.0.0 <2026.1.11725; version=2026.2.0 <2026.2.13344; version=2026.3.0 <2026.3.11816

Published CVSS scores

No CVSS assessment is available in this record.

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

T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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