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CVE-2026-76909— Unleash: CR-approval email renders user-controlled raw HTML

Quick assessment

Affected
Unleash unleash
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 2.1 · Low
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I. Basic Information for CVE-2026-76909

Vulnerability Information

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Vulnerability Title
Unleash: CR-approval email renders user-controlled raw HTML
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unleash unleash < 8.0.3 -

II. Public POCs for CVE-2026-76909

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III. Intelligence Information for CVE-2026-76909

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Other References for CVE-2026-76909 (1)

Other References for CVE-2026-76909 (2)

Same Patch Batch · Unleash · 2026-09-22 · 4 CVEs total

CVE-2026-77426 7.1 HIGH Unleash: Missing await on permission check + cross-project IDOR in admin API
CVE-2026-76910 5.3 MEDIUM Unleash: Clone-feature lets a user copy a feature from a project they cannot read
CVE-2026-77425 4.3 MEDIUM Unleash: A project member can reorder activation strategies belonging to any other project

IV. Related Vulnerabilities

Same product: unleash
Same vendor: Unleash
Same weakness: CWE-79

V. Comments for CVE-2026-76909

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