Denial of Service Vulnerability in WPGraphQL Plugin for WordPress
CVE-2021-47959

8.7HIGH

Key Information:

Vendor

WordPress
Status
WPgraphql
Vendor
CVE Published:
15 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47959?

The WPGraphQL Plugin, specifically version 1.3.5, is susceptible to a denial of service vulnerability. This flaw enables unauthenticated attackers to deplete server resources using maliciously crafted batched GraphQL queries with duplicate fields. By sending POST requests that exploit field duplication, these attackers can induce out-of-memory conditions and MySQL connection errors, jeopardizing the availability of affected sites. It's crucial for administrators to apply necessary updates or mitigations to protect their environments from potential exploitation.

Affected Version(s)

WPGraphQL 1.3.5

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47959 - Proof of Concept

References

https://www.exploit-db.com/exploits/49807
exploit
https://www.wpgraphql.com/
product
https://www.vulncheck.com/advisories/wordpress-plugin-wpg...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Dolev Farhi
.