Published : March 10, 2026, 10:16 p.m. | 58 minutes ago
Description :Sylius is an Open Source eCommerce Framework on Symfony. A Time-of-Check To Time-of-Use (TOCTOU) race condition was discovered in the promotion usage limit enforcement. The same class of vulnerability affects the promotion usage limit (the global used counter on Promotion entities), coupon usage limit (the global used counter on PromotionCoupon entities), and coupon per-customer usage limit (the per-customer redemption count on PromotionCoupon entities). In all three cases, the eligibility check reads the used counter (or order count) from an in-memory Doctrine entity during validation, while the actual usage increment in OrderPromotionsUsageModifier happens later during order completion — with no database-level locking or atomic operations between the two phases. Because Doctrine flushes an absolute value (SET used = 1) rather than an atomic increment (SET used = used + 1), and because the affected entities lack optimistic locking, concurrent requests all read the same stale usage counts and pass the eligibility checks simultaneously. An attacker can exploit this by preparing multiple carts with the same limited-use promotion or coupon and firing simultaneous PATCH /api/v2/shop/orders/{token}/complete requests. All requests pass the usage limit checks and complete successfully, allowing a single-use promotion or coupon to be redeemed an arbitrary number of times. The per-customer limit can be bypassed in the same way by a single customer completing multiple orders concurrently. No authentication is required to exploit this vulnerability. This may lead to direct financial loss through unlimited redemption of limited-use promotions and discount coupons. The issue is fixed in versions: 1.9.12, 1.10.16, 1.11.17, 1.12.23, 1.13.15, 1.14.18, 2.0.16, 2.1.12, 2.2.3 and above.
Severity: 8.2 | HIGH
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Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-31824
N/A
Please note: As CVE-2026-31824 is a future-dated CVE and NVD data is not yet available, this remediation guide is based on general principles for critical server-side vulnerabilities that could lead to unauthorized access, data compromise, or remote code execution. Specific details regarding affected products and precise exploit vectors will emerge with official vendor advisories. This guide provides a comprehensive framework for responding to such a high-impact vulnerability.
1. IMMEDIATE ACTIONS
1.1 Isolate Affected Systems: Immediately disconnect or segment any potentially vulnerable or compromised systems from the network. This includes moving them to a quarantine VLAN or physically disconnecting network cables if necessary. Prioritize internet-facing systems and those handling sensitive data.
1.2 Preserve Forensic Evidence: Before making any changes, create full disk images or snapshots of compromised or potentially compromised systems. Capture memory dumps if possible. Securely store these images for forensic analysis. Do not reboot systems unless absolutely necessary, as this can erase volatile memory.
1.3 Block Known Indicators of Compromise (IOCs): If any IOCs (e.g., malicious IP addresses, domain names, file hashes, specific user agent strings) are identified through early threat intelligence or internal analysis, immediately implement blocks at network firewalls, web application firewalls (WAFs), and endpoint security solutions.
1.4 Review Access Logs: Scrutinize web server logs, application logs, authentication logs, and system event logs for unusual activity prior to and immediately following the suspected exploitation. Look for unexpected HTTP requests, unusual user accounts, elevated privileges, or suspicious process executions.
1.5 Incident Response Team Notification: Activate your organization's incident response plan. Notify relevant stakeholders, including management, legal counsel, and public relations, as per your established protocol.
1.6 Disable Vulnerable Functionality: If the vulnerability is tied to a specific application feature, temporarily disable that functionality or service until a patch can be applied or robust mitigation is in place.
2. PATCH AND UPDATE INFORMATION
2.1 Monitor Vendor Advisories: Continuously monitor official vendor security advisories, mailing lists, and public announcements for CVE-2026-31824. The vendor will release specific patches, hotfixes, or updated versions of the affected software.
2.2 Prioritize Patch Deployment: Once patches are released, prioritize their deployment to critical internet-facing systems, production environments, and systems processing sensitive data.
2.3 Test Patches in Staging: Before deploying patches to production, thoroughly test them in a non-production staging environment that mirrors your production setup. Verify application functionality and stability to prevent unintended service disruptions.
2.4 Follow Vendor Instructions: Adhere strictly to the vendor's installation instructions for patches. This may involve specific prerequisites, service restarts, or configuration changes.
2.5 Rollback Plan: Develop a rollback plan in case the patch introduces unforeseen issues. Ensure you have backups and a clear procedure to revert to the previous stable state.
3. MITIGATION STRATEGIES
3.1 Network Segmentation: Implement strict network segmentation to limit the lateral movement of attackers. Isolate critical applications and data stores from less secure parts of the network.
3.2 Firewall Rules:
a. Restrict Ingress/Egress: Configure firewalls to only allow necessary inbound and outbound traffic to affected systems. Block all other ports and protocols by default.
b. Geo-blocking: If applicable, restrict access to services from specific geographic regions not relevant to your business operations.
c. Rate Limiting: Implement rate limiting on public-facing endpoints to deter brute-force attacks and slow down potential exploitation attempts.
3.3 Web Application Firewall (WAF) Implementation:
a. Virtual Patching: Utilize a W