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Medium

Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass

  • Disclosed: 19.06.2026
  • Updated: 11.10.2026 10:22

Summary

The CartController defines a RateLimiter behavior that is only activated when the 'number' POST/GET parameter is explicitly provided.

Details

When an attacker submits coupon codes against the session-based cart (without passing a 'number' parameter), no rate limiting is applied. This allows unlimited attempts to guess coupon codes.

Vulnerable Code <img width="864" height="90" alt="resim" src="https://github.com/user-attachments/assets/a5197f10-f1fd-4331-93f9-9479d0ceebba" />

<img width="881" height="272" alt="resim" src="https://github.com/user-attachments/assets/d9db963f-5d1f-4b00-a4b4-5f2dfe2b71dd" /> <img width="861" height="271" alt="resim" src="https://github.com/user-attachments/assets/f7842493-3bc0-4e99-956c-7266bab15703" />

PoC

Complete instructions, including specific configuration details, to reproduce the vulnerability.

<img width="909" height="171" alt="resim" src="https://github.com/user-attachments/assets/cfc8c994-5e0c-48de-b728-464029beba0e" />

Impact

An attacker can enumerate all coupon codes through automated requests.

Remediation Apply rate limiting unconditionally on actionUpdateCart regardless of whether 'number' is present.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package craftcms/commerce >= 5.0.0, < 5.6.5, >= 4.0.0, < 4.11.2 5.6.5, 4.11.2

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness (CWE)
CWE-307
Platform
Composer
Package
craftcms/commerce
Disclosed
19.06.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-h5gm-x9wr-vhcm - CC BY 4.0

Vulnerability history: craftcms/commerce

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (21) in the archive
Total entries
21
First → latest
02.2026 06.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 5
  • Medium 13
  • Low 3

Disclosures per year

Severity:
  1. Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass this entry
    Medium CVE-2026-55795 >= 5.0.0, < 5.6.5, >= 4.0.0, < 4.11.2 5.6.5, 4.11.2
  2. Craft Commerce has a SQL Injection can lead to Remote Code Execution via TotalRevenue Widget
    High CVE-2026-32271 >= 4.0.0, < 4.10.3, >= 5.0.0, < 5.5.5 4.10.3, 5.5.5
  3. Craft Commerce hasVariant/hasProduct Blind SQL Injection
    High CVE-2026-32272 >= 5.0.0, < 5.6.0 5.6.0
  4. Craft Commerce has multiple Stored XSS in Commerce Inventory Page, Leading to Session Hijacking
    High CVE-2026-29175 >= 5.0.0, < 5.5.3 5.5.3
  5. Craft Commerce is vulnerable to SQL Injection in Commerce Inventory Table Sorting
    High CVE-2026-29174 >= 5.0.0, < 5.5.3 5.5.3
  6. Craft Commerce is Vulnerable to SQL Injection in Commerce Purchasables Table Sorting
    High CVE-2026-29172 >= 4.0.0, < 4.10.2, >= 5.0.0, < 5.5.3 4.10.2, 5.5.3

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