CVE-2026-89289: CWE-862 Missing Authorization in Fast Courier
Description
The Fast Courier WordPress plugin through 5.2.3 does not restrict an unauthenticated REST route that writes order fulfillment data, allowing unauthenticated attackers to overwrite the courier status and customer-facing tracking details of any WooCommerce order by supplying its id.
CVSS v3.1
Score 5.3medium
Affected software
Fast Courier
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-89289 is a missing authorization vulnerability (CWE-862) in the Fast Courier WordPress plugin through version 5.2.3. The plugin exposes a REST API route that does not require authentication and permits unauthenticated users to modify order fulfillment data. Exploiting this flaw, an attacker can overwrite the courier status and tracking information visible to customers for any WooCommerce order by providing the order ID. This could lead to misinformation about order status and tracking details.
Potential Impact
An unauthenticated attacker can manipulate order fulfillment data, potentially misleading customers about the status and tracking of their orders. This could undermine customer trust and disrupt order management processes. There is no indication of further impact such as data disclosure or privilege escalation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the affected REST route by implementing authentication or other access controls to prevent unauthenticated modifications.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-11T12:16:44.634Z
- State
- PUBLISHED
Threat ID: 6ac4964c2cdf04f656856a3b
Added to database: 10/06/2026, 06:33:48 UTC
Last enriched: 10/06/2026, 06:48:23 UTC
Last updated: 10/06/2026, 18:57:28 UTC
Views: 19
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