CVE-2026-76366 in Soar
Summary
by MITRE • 08/19/2026
In Splunk SOAR versions below 8.6.0, a user with a valid Splunk SOAR account could use Representational State Transfer (REST) API filtering on playbook runs to recover session tokens that compromise all data available to the affected user. The information disclosure is possible because Splunk SOAR does not block REST API filters from matching values that responses otherwise hide. For more information see REST Run Playbook (https://help.splunk.com/en/splunk-soar/soar-cloud/rest-api-reference/run-playbook-endpoints/rest-run-playbook) in the Splunk documentation.
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Analysis
by VulDB Data Team • 08/20/2026
A critical information disclosure vulnerability exists within Splunk SOAR versions prior to 8.6.0, specifically affecting the handling of Representational State Transfer API requests for playbook execution. This flaw allows an authenticated user with a valid account to exploit improper access control mechanisms inherent in the REST API filtering logic. The core technical issue stems from the application's failure to enforce consistent data visibility rules between request parameters and response payloads. Specifically, when users utilize REST API filters during playbook runs, the system processes these filters without adequately validating whether the requested fields or values are actually accessible within the context of the user's permissions. This architectural oversight means that filtering mechanisms can inadvertently match against internal state variables or session artifacts that are typically masked in standard responses due to security policies designed to hide sensitive operational data from end-users.
The exploitation of this vulnerability enables an attacker with legitimate credentials to recover session tokens and other sensitive information that should remain hidden. By crafting specific REST API requests with targeted filters, the malicious actor can force the system to return detailed internal states or token values in the response body. This constitutes a severe breach of confidentiality as it compromises all data available to the affected user account. The ability to extract these session tokens is particularly dangerous because it allows for potential session hijacking attacks. Once an attacker possesses a valid session token, they can impersonate the legitimate user within the Splunk SOAR environment without needing additional authentication factors or credentials, effectively bypassing identity verification controls and gaining unrestricted access to the platform's capabilities and data stores associated with that account.
From a classification perspective, this vulnerability aligns closely with CWE-209, which describes the generation of an error message that includes sensitive information, as well as CWE-798, involving the use of hard-coded or exposed credentials. In terms of offensive security frameworks such as MITRE ATT&CK, this behavior is indicative of techniques related to Credential Access and Discovery, specifically where attackers leverage API misconfigurations to harvest authentication artifacts. The operational impact extends beyond simple data leakage; it undermines the integrity of the entire SOAR deployment by allowing lateral movement within the platform if multiple accounts are compromised through token theft. This can lead to unauthorized automation execution, manipulation of security workflows, and potential exfiltration of sensitive organizational intelligence processed by the SOAR instance.
To mitigate this risk, organizations running Splunk SOAR must immediately upgrade to version 8.6.0 or later, where these filtering logic flaws have been addressed in subsequent patches. Until an upgrade is feasible, administrators should implement strict network-level access controls to restrict REST API endpoints to trusted IP addresses and enforce multi-factor authentication for all user accounts to reduce the impact of potential token theft. Additionally, security teams should audit existing playbook runs and API usage logs for anomalous filtering patterns that may indicate active exploitation attempts. Regular review of role-based access control policies is also recommended to ensure that users only have permissions necessary for their specific functions, thereby limiting the scope of data exposure even if such vulnerabilities are present in older versions.