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VulnerabilityPublished

CVE-2026-88764: Simple Membership (WordPress plugin) · Improper Privilege Management

Affects Simple Membership (WordPress plugin)Source CVE Database V5

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Not known to be exploited · CVSS 5.4 Medium : upgrade to 4.7.8 when convenient.

Data as of 29 Oct 2026, 07:15 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.7.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade Simple Membership (WordPress plugin) to 4.7.8.

Affected software

ProductAffectedFixed in
Simple MembershipAffected
  • <4.7.8
Fixed in
  • 4.7.8

AI-suggested

Upgrade the Simple Membership plugin to version 4.7.8 or later, where this validation issue is fixed. No other mitigation is indicated. Patch status is confirmed by the version boundary; versions before 4.7.8 are vulnerable.

Description

The Simple Membership WordPress plugin before 4.7.8 does not validate that the membership level supplied in a PayPal payment notification matches the level configured for the paid payment button, allowing members to pay for a lower-priced membership while being granted a higher, more privileged membership level.

References

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