CVE-2021-47946 Overview
CVE-2021-47946 is a Cross-Site Request Forgery (CSRF) vulnerability [CWE-352] affecting OpenCart 3.0.3.6. The flaw resides in the /account/edit endpoint, which fails to validate request origin or enforce anti-CSRF tokens. An attacker who lures an authenticated victim to a malicious page can silently modify the victim's account details, including the registered email address. Once the email is changed, the attacker triggers the password reset workflow to receive a reset link and seize control of the account. The vulnerability requires no authentication on the attacker side and no privileged access, only social engineering to coerce the victim into visiting the attacker-controlled page.
Critical Impact
Unauthenticated attackers can hijack OpenCart user accounts by tricking authenticated victims into visiting a malicious page, leading to full account takeover via the password reset flow.
Affected Products
- OpenCart 3.0.3.6
- OpenCart 3.x branch (account edit endpoint)
- Self-hosted OpenCart storefronts exposing /account/edit
Discovery Timeline
- 2026-05-10 - CVE-2021-47946 published to NVD
- 2026-05-12 - Last updated in NVD database
Technical Details for CVE-2021-47946
Vulnerability Analysis
The vulnerability is a classic Cross-Site Request Forgery flaw in the OpenCart customer account module. The /account/edit endpoint accepts state-changing POST requests using the authenticated session cookie without verifying a CSRF token or checking the Origin or Referer headers. Because browsers automatically attach cookies to cross-origin requests, an attacker-controlled page can submit a forged form that updates the victim's profile fields. The attack chain pivots from profile modification to account takeover. By changing the victim's registered email address, the attacker decouples the account from the legitimate owner. The attacker then invokes the standard password reset workflow, which delivers the reset token to the now attacker-controlled email address.
Root Cause
The root cause is the absence of synchronizer tokens or SameSite cookie controls on sensitive account management endpoints. The application trusts session cookies as sole proof of intent, ignoring the OWASP recommendation to bind each state-changing request to a per-session anti-CSRF token.
Attack Vector
Exploitation requires the victim to be authenticated to the OpenCart storefront and to visit an attacker-controlled web page. The malicious page hosts an auto-submitting HTML form targeting /index.php?route=account/edit with attacker-chosen email and profile fields. Once submitted, the OpenCart session updates silently. The attacker then visits the password reset endpoint, enters the new email, and receives credentials for the hijacked account. Public exploit code is documented in Exploit-DB #49407 and the VulnCheck Advisory on OpenCart CSRF.
No verified code sample is reproduced here. Refer to the published advisories for the proof-of-concept HTML form structure.
Detection Methods for CVE-2021-47946
Indicators of Compromise
- POST requests to /index.php?route=account/edit containing Referer headers pointing to external or unexpected origins.
- Rapid sequence of account email changes followed by password reset requests for the same account.
- Password reset emails delivered to addresses that differ from historical account email patterns.
- Customer support tickets reporting lost access immediately after browsing unfamiliar links.
Detection Strategies
- Inspect web server access logs for account/edit POST requests lacking a same-origin Referer or Origin header.
- Correlate profile email changes with subsequent account/forgotten or account/reset activity within short time windows.
- Deploy a Web Application Firewall (WAF) rule that blocks state-changing requests missing a valid CSRF token parameter.
Monitoring Recommendations
- Alert on any account whose email attribute changes more than once within 24 hours.
- Monitor outbound password reset email volume for unusual spikes against the OpenCart user base.
- Log and review HTTP Referer distribution for all /account/* POST endpoints.
How to Mitigate CVE-2021-47946
Immediate Actions Required
- Upgrade OpenCart to the latest 3.x or 4.x release that enforces CSRF tokens on account endpoints.
- Force a password and email-confirmation reset for any account that changed its email address recently.
- Deploy a WAF rule blocking POSTs to /index.php?route=account/edit without a same-origin Referer.
Patch Information
No specific vendor patch identifier is referenced in the available advisory data. Administrators should obtain the latest stable build from the OpenCart Downloads Page and review changelogs for CSRF token enforcement on customer account routes. Consult the VulnCheck Advisory on OpenCart CSRF for upgrade guidance.
Workarounds
- Set the session cookie SameSite attribute to Lax or Strict to block cross-site cookie attachment on form submissions.
- Implement a custom pre-controller hook that validates a per-session CSRF token on all account/* POST routes.
- Require email-link confirmation before applying any change to a customer's registered email address.
- Restrict the storefront's Content-Security-Policy to prevent embedding by untrusted origins.
# Example: enforce SameSite cookies in PHP session configuration
# Add to php.ini or .htaccess for the OpenCart host
session.cookie_samesite = "Strict"
session.cookie_secure = 1
session.cookie_httponly = 1
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
