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CVE-2026-76909

Unleash: CR-approval email renders user-controlled raw HTML

CVSS 4.0 2.1 LOWEUVD CVSS 4.0 2.1 CVSS 4.0 · [email protected] · Secondary 2.1 LOWCVSS_V4 Publisher rating LOWFixed by unleash-server 8.0.3KEV status unknown
Original advisory

cve-program · CVE-2026-76909

Published

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.

Read the publisher's advisory

euvd · EUVD-2026-84824

Published

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.

Read the publisher's advisory

nvd · CVE-2026-76909

Published

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.

Read the publisher's advisory

osv · GHSA-7hvx-28gp-mf6j

Published

### Summary The change-request approval HTML email template renders fields as raw HTML. User who can create a change request can inject HTML into approval notification emails. I was not able to confirm Enterprise platform is using vulnerable code nor that it doesn't sanitize input. ### Details `src/mailtemplates/requested-cr-approval/requested-cr-approval.html.mustache` uses Mustache triple-stash syntax for fields that can originate from users: ```mustache {{{ changeRequestTitle }}} {{{ requesterName }}} {{{ requesterEmail }}} {{{ changeRequestLink }}} ``` Triple-stash disables HTML escaping even when Mustache's global escape function is safe. The related renderer is `sendRequestedCRApprovalEmail` in `src/lib/services/email-service.ts`, which renders the template with `Mustache.render`. ### PoC 1. Use an Enterprise deployment with change requests and approval emails enabled. 2. As a project member who can create change requests, set a display name or change-request title to HTML such as: ```html </a><a href="https://example.com">Approve change request</a> ``` 3. Create a change request that requires approval. 4. Observe that the approval email contains attacker-controlled raw HTML instead of escaped text. ### Impact Change-request approvers can receive forged links, tracking pixels, or visually altered email content.

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

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This view includes predictions for CVE identifiers explicitly listed in public NuGet advisories. Microsoft release pages have their own prediction coverage. Check source status for the scope and latest checks.

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cve-program · CVE-2026-76909

Published

Unleash: CR-approval email renders user-controlled raw HTML

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 published
22 Sep 2026 20:18:25 UTC
Source modified
23 Sep 2026 14:36:10 UTC
Saved here
23 Oct 2026 15:48:27 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 2.1 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

euvd · EUVD-2026-84824

Published

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,…

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.

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 22, 2026, 8:18:25 PM

dateUpdated: Sep 23, 2026, 2:36:10 PM

Source published
Sep 22, 2026, 8:18:25 PM (timezone not stated)
Source modified
Sep 23, 2026, 2:36:10 PM (timezone not stated)
Saved here
11 Nov 2026 16:08:02 UTC
Source terms
ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 4.0 · 2.1 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

nvd · CVE-2026-76909

Published

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,…

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.

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-79

Original publisher date fields

published: 2026-09-22T21:17:31.880

lastModified: 2026-09-23T18:12:04.247

Source published
22 Sep 2026 21:17:31 UTC
Source modified
23 Sep 2026 18:12:04 UTC
Saved here
25 Oct 2026 16:19:04 UTC
Source terms
NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · [email protected] · Secondary · 2.1 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

osv · GHSA-7hvx-28gp-mf6j

Published

Unleash: CR-approval email renders user-controlled raw HTML

### Summary The change-request approval HTML email template renders fields as raw HTML. User who can create a change request can inject HTML into approval notification emails. I was not able to confirm Enterprise platform is using vulnerable code nor that it doesn't sanitize input. ### Details `src/mailtemplates/requested-cr-approval/requested-cr-approval.html.mustache` uses Mustache triple-stash syntax for fields that can originate from users: ```mustache {{{ changeRequestTitle }}} {{{ requesterName }}} {{{ requesterEmail }}} {{{ changeRequestLink }}} ``` Triple-stash disables HTML escaping even when Mustache's global escape function is safe. The related renderer is `sendRequestedCRApprovalEmail` in `src/lib/services/email-service.ts`, which renders the template with `Mustache.render`. ### PoC 1. Use an Enterprise deployment with change requests and approval emails enabled. 2. As a project member who can create change requests, set a display name or change-request title to HTML such as: ```html </a><a href="https://example.com">Approve change request</a> ``` 3. Create a change request that requires approval. 4. Observe that the approval email contains attacker-controlled raw HTML instead of escaped text. ### Impact Change-request approvers can receive forged links, tracking pixels, or visually altered email content.

Source published
22 Sep 2026 20:34:38 UTC
Source modified
22 Sep 2026 21:00:07 UTC
Saved here
24 Oct 2026 13:17:17 UTC
Source terms
GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V4 · 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

Publisher rating · LOW

ChangeIntel

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Sources read 12 Nov 17:32 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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