CVE-2026-56828

HIGHPre-NVD 8.88.8
EchelonGraph scoreLOW confidence

This high-severity CVE scores 8.8 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Shopper: privilege escalation via improper Livewire admin component authorization

Summary

Three Livewire admin components in shopper/framework (latest master at commit fcd0c59, released as v2.8.0) gate state-mutating actions on the read-only view_users permission. This is the same class as the issue Shopper fixed in v2.8.0 / PR #511 / GHSA-f946-9qp6-vgch — the PR moved most write actions from view_users to access_setting, but three were missed (one of them is a brand-new file added by the security commit itself).

A staff user holding only view_users + access_dashboard (a realistic "support" or "viewer" role per Shopper's own PermissionsTableSeeder) can: (1) self-escalate by granting any permission to their own role; (2) create a brand-new admin team member with a chosen password and the admin role and then log in as that user; (3) delete arbitrary permissions rows (RBAC DoS) or — when can_be_removed=true — delete entire roles.

CVSS 3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H = 8.8 (High). CWE-285 (Improper Authorization) + CWE-862 (Missing Authorization).

Vulnerable components (paths relative to repo root)

1) packages/admin/src/Livewire/Components/Settings/Team/Permissions.php

  • togglePermission(int $id) at line 28 calls $this->authorize('view_users');
  • removePermission(int $id) at line 55 calls $this->authorize('view_users');

The Permissions blade at packages/admin/resources/views/livewire/components/settings/team/permissions.blade.php line 34 emits every permission's id directly in wire:click handlers, so the attacker does not even need to guess IDs — the page itself enumerates them.

Net effect: any user who can mount the Permissions component (gated on view_users) can grant any permission row to the bound $role. Granting access_setting to the attacker's own role unlocks every action that PR #511 supposedly hardened with ->authorize('access_setting'). Granting delete_customers, edit_orders, edit_products, add_brands, etc. is direct data-modification escalation.

2) packages/admin/src/Livewire/SlideOvers/CreateTeamMember.php

  • mount() at line 53 calls $this->authorize('view_users');
  • store() at line 122 calls $this->authorize('view_users');

This file is new file mode 100755 in commit fcd0c59 — it was created as part of the security fix and inherited the same misclassified gate.

store() creates a User with email_verified_at = now(), the attacker's chosen password, and any selected role_id. The Radio::make('role_id') options filter only excludes config('shopper.admin.roles.user'), so the admin role is selectable. Log out, log in as the new account → full admin.

3) packages/admin/src/Livewire/Pages/Settings/Team/RolePermission.php

  • deleteAction at lines 81-90: only gated by ->visible($this->role->can_be_removed), with no ->authorize() chain.

Page-level mount (line 52) requires only view_users. For any role with can_be_removed = true, a view_users-only user can call the action and delete the role (cascading the loss of permissions for every assigned user).

Self-confirmation in the project's own test suite

The following tests are green on master @ fcd0c59 — they ARE the PoC:

tests/Admin/Livewire/Components/Settings/Team/PermissionsTest.php
  line 14-16: givePermissionTo('view_users') only
  line 36-45: "can toggle permission to role" — passes
  line 74-85: "can remove permission" — passes
tests/Admin/Livewire/SlideOvers/CreateTeamMemberTest.php
  line 16-18: givePermissionTo('view_users') only
  line 29-56: "can create new team member" — passes, asserts the new user hasRole('manager')

A view_users-only Livewire user actor successfully toggles permissions, removes permissions, and creates a new privileged user — verified by Shopper's own regression tests.

Suggested fix

Change $this->authorize('view_users') to $this->authorize('access_setting') in:

  • Permissions::togglePermission
  • Permissions::removePermission
  • Permissions::mount (defence in depth, matches Team\Index)
  • CreateTeamMember::mount
  • CreateTeamMember::store

Add ->authorize('access_setting') to RolePermission::deleteAction (matches the pattern already applied to generatePermissionsAction, createPermissionAction, and Team\Index::DeleteAction).

Update the two regression tests to use access_setting instead of view_users so they accurately reflect the privilege boundary.

Resources

  • Prior advisory of the same class: https://github.com/shopperlabs/shopper/security/advisories/GHSA-f946-9qp6-vgch
  • Fix commit that introduced these residual gaps: https://github.com/shopperlabs/shopper/commit/fcd0c5920588702df5b874f432b1042abd77a50b
  • CWE-285 Improper Authorization
  • CWE-862 Missing Authorization

Credits

Reported by Vishal Shukla(@shukla304) using sechub.dev AI Agent

Support

If this disclosure was useful and if users would like to support continued open-source security research and responsible-disclosure work, they can sponsor at https://github.com/sponsors/therawdev — Shoppers thanks those who keeping open source safe.

CVSS v3
8.8
EG Score
8.8HIGHlow confidence
EG Risk
44
EG Risk 44/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 11, 2026

Last Modified

September 11, 2026

Vendor Advisories for CVE-2026-56828(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
shopper/frameworkv2.8.0, v2.8.1, v2.9.0, v2.9.1
  • 2.8.0 up to 2.9.2: fixed in 2.9.2
—

Data Freshness Timeline

(refreshed 0× in last 7d / 2× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-29 02:07 UTCEG score recompute
  2. 2026-09-11 22:24 UTCEG score recompute

Related CVEs(same product)

Frequently asked(4)

What is CVE-2026-56828?
CVE-2026-56828 is a high vulnerability published on September 11, 2026. Shopper: privilege escalation via improper Livewire admin component authorization Summary Three Livewire admin components in shopper/framework (latest master at commit fcd0c59, released as v2.8.0) gate state-mutating actions on the read-only viewusers permission. This is the same class as the issue…
When was CVE-2026-56828 disclosed?
CVE-2026-56828 was first published on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-56828?
CVE-2026-56828 has a CVSS base score of 8.8 (the CNA's own assessment, by github_m; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-56828?
A fix for CVE-2026-56828 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56828 are linked in the Vendor Advisories panel on this page.

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