Vulnerability · Published Sep 22, 2026 · Assigned by GitHub_M

CVE-2026-76910Unleash: Clone-feature lets a user copy a feature from a project they cannot read

Medium 5.3

In plain English

A medium-severity authorization bypass via user-controlled key in unleash from Unleash. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.4%top 64.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Unleash is an open-source feature management platform. Prior to 8.0.3, cloneFeatureToggle and POST /api/admin/projects/:projectId/features/:featureName/clone authorize creation in the destination project but do not verify access to the source project. Because feature names are globally unique, a user with create or clone permission in one project who knows or guesses another project's feature name can copy that feature into the authorized project and inspect its strategy parameters, constraints, variants, and variant payloads. This issue is fixed in version 8.0.3.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	unleash-server	8.0.3	GHSA-8xcj-9hfr-fh9j

Affected products (as reported)

Vendor	Product	Versions
Unleash	unleash	< 8.0.3

Weakness: CWE-639 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/Unleash/unleash/security/advisories/GHSA-8xcj-9hfr-fh9j x_refsource_CONFIRM
https://github.com/Unleash/unleash/commit/2dc6ac0e8ba524ec7a2e9bc96a0e01d9d6f5a35a x_refsource_MISC
https://github.com/Unleash/unleash/releases/tag/v8.0.3 x_refsource_MISC