Unleash up to 8.0.2 Email Template requested-cr-approval.html.mustache sendRequestedCRApprovalEmail changeRequestTitle/requesterName/requesterEmail injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Unleash up to 8.0.2. This affects the function sendRequestedCRApprovalEmail of the file src/mailtemplates/requested-cr-approval/requested-cr-approval.html.mustache of the component Email Template. Executing a manipulation of the argument changeRequestTitle/requesterName/requesterEmail can lead to injection. The identification of this vulnerability is CVE-2026-76909. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Unleash up to 8.0.2. It has been declared as critical. This vulnerability affects the function sendRequestedCRApprovalEmail of the file src/mailtemplates/requested-cr-approval/requested-cr-approval.html.mustache of the component Email Template. The manipulation of the argument changeRequestTitle/requesterName/requesterEmail with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Unleash is an open-source feature management platform. Prior to 8.0.3, the change-request approval email template at src/mailtemplates/requested-cr-approval/requested-cr-approval.html.mustache renders the user-controlled changeRequestTitle, requesterName, and requesterEmail values without HTML escaping, and sendRequestedCRApprovalEmail passes those values to Mustache rendering. A project member who can create a change request when approval emails are enabled can inject HTML into an approver's notification, allowing forged links, tracking content, or visually altered email content. This issue is fixed in version 8.0.3.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-76909 since 08/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1055.

Upgrading to version 8.0.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-84824). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Unleash

Version

• 8.0.0
• 8.0.1
• 8.0.2

Website

• Product: https://github.com/Unleash/unleash/

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Once again VulDB remains the best source for vulnerability data.

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