Resource exhaustion in Wpgraphql
CVE-2021-47959
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (36.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Wpgraphql — versions 1.3.5
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49807 (exploit)
- www.wpgraphql.com/ (product)
- www.vulncheck.com/advisories/wordpress-plugin-wpgraphql-denial-of-service (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47959?
- CVE-2021-47959 is a high-severity vulnerability in Wpgraphql, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-05-15.
- How severe is CVE-2021-47959?
- High severity. CVSS v3 base score is 7.5 out of 10.