CVE-2026-77789Public exploitNetwork attack vector

Cross-customer subscription modification via missing ownership check

Published Aug 26, 2026 · Updated Aug 26, 2026

Authorization bypass in Themeisle WP Full Pay before 8.5.1 allows remote authenticated users to modify other customers' subscriptions. The subscription-management REST endpoint accepts a user-controlled Stripe subscription ID without verifying ownership against the confirmed portal session. A valid customer portal session and knowledge of another customer's subscription ID are required to cancel, reactivate, or change its plan or quantity.

CVSS severity4.3
Medium
EPSS probability0.20%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Themeisle WP Full Pay before 8.5.1 allows remote authenticated users to modify other customers' subscriptions. The subscription-management REST endpoint accepts a user-controlled Stripe subscription ID without verifying ownership against the confirmed portal session. A valid customer portal session and knowledge of another customer's subscription ID are required to cancel, reactivate, or change its plan or quantity.

The record

CVE
CVE-2026-77789
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
Query Solutions Ltd.
Product
WP Full Pay
Classifications
CWE-639, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <8.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Query Solutions Ltd. · WP Full Payversion=0 <8.5.1

Published CVSS scores

4.3CISA ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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