Platform
nodejs
Component
saleor
Opgelost in
2.0.1
3.21.1
3.22.1
3.23.1
CVE-2026-33756 is een Denial of Service (DoS) kwetsbaarheid die is ontdekt in de Saleor e-commerce platform. Een ongeauthenticeerde aanvaller kan een groot aantal GraphQL-operaties in één HTTP-verzoek versturen, waardoor de resources van de server worden uitgeput en de beschikbaarheid wordt aangetast. Deze kwetsbaarheid treft Saleor versies vanaf 2.0.0 tot en met versies eerder dan 3.23.0a3, inclusief 3.22.47, 3.21.54 en 3.20.118. Een patch is beschikbaar in versies 3.23.0a3, 3.22.47, 3.21.54 en 3.20.118.
The core of this vulnerability lies in Saleor's GraphQL query batching implementation. While intended to improve performance by allowing multiple queries in a single request, the system lacked proper limits on the number of operations. An attacker can craft a malicious HTTP request containing a large array of GraphQL operations, effectively bypassing the per-query complexity limits. This can lead to excessive CPU usage, memory exhaustion, and ultimately, a denial of service, rendering the e-commerce platform unavailable to legitimate users. The lack of authentication means any external user can trigger this vulnerability, significantly expanding the potential attack surface. The impact is particularly severe for businesses relying on Saleor for online sales and customer interactions, as a successful attack could result in lost revenue and reputational damage.
This vulnerability was publicly disclosed on 2026-04-08. Currently, there is no indication of active exploitation campaigns targeting CVE-2026-33756. The vulnerability is not listed on CISA KEV as of this writing. While a public proof-of-concept is not yet available, the ease of exploitation (unauthenticated, simple HTTP request) suggests a high likelihood of a PoC being developed and potentially leveraged in attacks.
E-commerce businesses utilizing Saleor, particularly those running vulnerable versions (2.0.0–>= 3.23.0-a.0, < 3.23.0a3) in production environments. Shared hosting environments where Saleor instances share resources are at heightened risk, as an attack on one instance could impact others.
• nodejs / server:
# Monitor Saleor server resource usage (CPU, memory)
# Use tools like top, htop, or Prometheus• generic web:
# Check access logs for unusually large GraphQL requests
# grep -i 'graphql' /var/log/nginx/access.log | grep -i 'batching'disclosure
Exploit Status
EPSS
0.11% (29% percentiel)
CISA SSVC
CVSS-vector
The primary mitigation for CVE-2026-33756 is to upgrade to a patched version of Saleor. Versions 3.23.0a3, 3.22.47, 3.21.54, and 3.20.118 contain the necessary fixes to limit the number of operations in GraphQL batch requests. If an immediate upgrade is not feasible, consider implementing a Web Application Firewall (WAF) or reverse proxy with rules to limit the size and complexity of incoming GraphQL requests. Specifically, look for rules that restrict the number of operations within a single request. Additionally, monitor Saleor server resources (CPU, memory) for unusual spikes, which could indicate an ongoing attack. After upgrading, confirm the fix by sending a large batch of GraphQL queries and verifying that the server handles them without resource exhaustion.
Actualice a la versión 3.23.0a3, 3.22.47, 3.21.54 o 3.20.118 para mitigar la vulnerabilidad. Estas versiones incluyen una limitación en el número de operaciones permitidas en las consultas GraphQL por lotes, previniendo el agotamiento de recursos.
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CVE-2026-33756 is a Denial of Service vulnerability in Saleor allowing unauthenticated attackers to exhaust server resources via malicious GraphQL requests. It affects versions 2.0.0–>= 3.23.0-a.0, < 3.23.0a3.
You are affected if you are running Saleor versions 2.0.0 through 3.23.0-a.0, excluding 3.23.0a3, 3.22.47, 3.21.54, and 3.20.118.
Upgrade to Saleor version 3.23.0a3, 3.22.47, 3.21.54, or 3.20.118. Consider WAF rules to limit GraphQL request size as a temporary workaround.
There is currently no evidence of active exploitation, but the vulnerability's ease of exploitation suggests a potential risk.
Refer to the Saleor security advisories on their official website or GitHub repository for the latest information.
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