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CVE-2021-20678

27
FAUCET Score

CVE-2021-20678 is a high-severity SQL injection vulnerability affecting Paid Memberships Pro versions prior to 2.5.6, allowing remote authenticated attackers to execute arbitrary SQL commands. With a CVSS score of 8.8, this vulnerability is easily exploitable over the network with low attack complexity, potentially leading to full compromise of confidentiality, integrity, and availability. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the potential impact remains significant.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.5.6CPE matchmatch criteria
cpe:2.3:a:strangerstudios:paid_memberships_pro:*:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.04%
Probability of exploitation in next 30 days
EPSS Percentile
79.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0204 is in the 78th percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

jvn.jp / en/jp/JVN08191557/index.html
Third Party Advisory
wordpress.org / plugins/paid-memberships-pro
ProductThird Party Advisory
paidmembershipspro.com / pmpro-update-2-5-6
Vendor Advisory