CVE-2026-8296 in Octopus Server
Summary
by MITRE • 06/19/2026
In affected versions of Octopus Server with certain access levels it was possible to embed a Cross-Site Scripting Payload via artifacts.
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Analysis
by VulDB Data Team • 06/19/2026
This vulnerability exists within Octopus Server versions that permit specific access levels to manipulate artifact data through embedded cross-site scripting payloads. The flaw represents a classic cross-site scripting vulnerability that allows attackers with sufficient privileges to inject malicious scripts into artifact entries, which can then be executed when other users view these artifacts. The vulnerability stems from inadequate input validation and output encoding mechanisms within the artifact handling subsystem of the Octopus Server platform. When users navigate to pages displaying these artifacts, the malicious scripts execute in the context of the victim's browser session, potentially enabling unauthorized access to sensitive data or system functions.
The technical implementation of this vulnerability leverages the server's artifact processing capabilities to store and display user-supplied content without proper sanitization. Attackers with appropriate access levels can craft malicious payloads that exploit the server's failure to adequately validate or escape special characters in artifact metadata. This allows for script execution within the context of legitimate user sessions, creating potential for privilege escalation, data exfiltration, or session hijacking attacks. The vulnerability is particularly concerning in enterprise environments where Octopus Server serves as a deployment management platform, as it could enable attackers to compromise the entire deployment pipeline.
The operational impact of this vulnerability extends beyond simple script execution, as it can facilitate more sophisticated attacks within the deployment environment. An attacker could potentially use this vulnerability to access deployment credentials, modify artifact contents, or gain unauthorized access to production systems through compromised deployment processes. The attack surface is expanded when considering that artifact data often contains sensitive information about deployments, system configurations, or security credentials. Organizations using Octopus Server in production environments face significant risk of supply chain compromise if attackers can successfully exploit this vulnerability to inject malicious code into artifact repositories.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding mechanisms throughout the artifact handling pipeline. Organizations should ensure that all user-supplied data is properly sanitized before storage and that appropriate content security policies are enforced during artifact display. Regular security updates and patch management processes should be implemented to address known vulnerabilities in Octopus Server installations. Additionally, access controls should be strictly enforced to limit the ability of unauthorized users to modify artifact data, following principle of least privilege methodologies. The vulnerability aligns with CWE-79 which addresses cross-site scripting flaws, and may map to ATT&CK techniques involving command and control through compromised deployment systems. Organizations should conduct thorough security assessments of their Octopus Server installations to identify and remediate similar vulnerabilities in related components.