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CVE-2021-47959: WordPress Plugin WPGraphQL 1.3.5 Denial of Service

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-15 · updated 2026-06-17
• Weakness: CWE-770

Description

WordPress Plugin WPGraphQL 1.3.5 contains a denial of service vulnerability that allows unauthenticated attackers to exhaust server resources by sending batched GraphQL queries with duplicated fields. Attackers can send POST requests to the GraphQL endpoint with amplified field duplication payloads to trigger server out-of-memory conditions and MySQL connection errors.

Affected products

• WPGraphQL: 1.3.5

References

• https://www.exploit-db.com/exploits/49807
• https://www.vulncheck.com/advisories/wordpress-plugin-wpgraphql-denial-of-service
• https://www.wpgraphql.com/

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