DevGuard has improper authorization on public assets

Impact

On a DevGuard API instance with one or more public assets, any authenticated user — including users from a different organization with no membership or role in the affected org/project — can create, update, reapply, and delete VEX rules on those public assets. The same flaw affects the other vulnerability-triage write endpoints exposed under a public asset, including:

• VEX rule create / update / reapply / delete
• Dependency-vuln event creation (accept / reject / mitigate decisions), batch event creation, vuln sync, and mitigation
• License risk creation
• External reference writes
• Artifact creation and license refresh

The attacker needs a valid account on the instance, but no membership in the victim organization, project, or asset is required.

Security impact is primarily to integrity of the vulnerability picture of public assets: an attacker can mark CVEs as false-positive, silence vulnerabilities, attach misleading justifications, or delete legitimate triage rules — undermining the trustworthiness of every consumer of the affected asset's VEX/SBOM output. Because public assets are by definition consumed by third parties (downstream users, supply-chain consumers, the published vex.json/sbom.json), the blast radius extends to anyone relying on that data.

Private assets are not affected by this advisory: the public-read exemption that enables the bypass does not apply to them, and access remains correctly gated by organization/project membership. The private setting is only relevant in DevGuard itself — there is no impact given when you have an open-source project on e.g. GitLab/GitHub and a private DevGuard asset connected.

Patches

Version v1.4.2contains a patch. Users should upgrade to the patched release as soon as it is available.

Workarounds

If developers cannot upgrade their applications immediately:

• ** They should make affected assets non-public.** In the asset settings, switch visibility from public to private. This removes the public-read exemption in the access-control middleware and restores correct authorization on all write endpoints for that asset. Downstream consumers that previously relied on the public vex.json / sbom.json endpoints will need to be granted explicit access or must receive an exported file version until the patched release is deployed.

Resources

Fixed commit: https://github.com/l3montree-dev/devguard/commit/1be88ec1309a5dc0566e35a23bdc4ea3ecd11417

Credit

DeevGuard thanks @philipflohr (awesome-it.de) for finding and responsibly reporting this vulnerability!