CVE-2026-8296Network attack vector

Stored XSS via artifact-embedded payloads

Published Jun 19, 2026 · Updated Jun 19, 2026

Stored XSS in affected Octopus Server versions allows remote authenticated users to execute scripts via crafted deployment artifacts. Octopus Deploy states that artifacts can embed the payload but has not disclosed the rendering locus or missing output-neutralization operation. Exploitation requires high-privilege access and an active victim action, and the published impact is data disclosure in the victim's browser context.

CVSS severity5.6
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in affected Octopus Server versions allows remote authenticated users to execute scripts via crafted deployment artifacts. Octopus Deploy states that artifacts can embed the payload but has not disclosed the rendering locus or missing output-neutralization operation. Exploitation requires high-privilege access and an active victim action, and the published impact is data disclosure in the victim's browser context.

The record

CVE
CVE-2026-8296
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
Octopus Deploy
Product
Octopus Server
Classifications
CWE-79, T1189
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 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.

  1. Affected versionversion=2023.0.0 <2025.4.10678
  2. Affected versionversion=2026.1.0 <2026.1.11451
  3. Affected versionversion=2026.2.0 <2026.2.13114

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Octopus Deploy · Octopus Serverversion=2023.0.0 <2025.4.10678; version=2026.1.0 <2026.1.11451; version=2026.2.0 <2026.2.13114

Published CVSS scores

5.6Octopus DeployCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA: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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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