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VulnerabilityCVE-2026-53642Published 2026-07-06

CVE-2026-53642 — FOSSBilling

medium (derived)

As of 2026-07-07, CVE-2026-53642 is a Medium-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in FOSSBilling, CVSS v4.0 5.3, EPSS 0.2% (13.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-53642 as of 2026-07-07; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v4.0
5.3/10Medium (derived)
EPSS
0.2%Higher than 13.2% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
3.2/10Threadlinqs triage score
Published
Updated 2026-07-07
CVSS v4.0 5.3 (Medium, derived from score) · EPSS 0.2% (higher than 13.2% of all scored CVEs) · Priority 3.2/10 · Published 2026-07-06

Last updated:

What is CVE-2026-53642?

FOSSBilling is a free, open-source billing and client management system. In versions 0.5.6 through 0.7.2, when the "Require Email Confirmation" setting is enabled, a logged-in client with an unverified email address (`email_approved = 0`) can access all client-area pages (e.g. `/client/balance`, `/client/order/list`, `/client/invoice`) and read real account data, including wallet balances and transaction history. The API-side enforcement correctly restricts unverified clients to only profile-related endpoints, but the page-side enforcement is overly permissive, allowing any request whose path starts with `/client`. Version 0.8.0 contains a fix. No known workarounds that don't involve modifying the source code are available.

The record classifies CVE-2026-53642 under weakness class CWE-863. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 91 days ago.

Severity and exploitation probability

CVSS v4.0 base score
5.3 — Medium (derived from score)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS (FIRST)
0.2% probability of exploitation in the next 30 days, higher than 13.2% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
3.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-07-06, last modified 2026-07-07

Is CVE-2026-53642 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-53642

No vendor patch reference has been recorded for CVE-2026-53642 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-53642

No threat campaign in the Threadlinqs corpus currently references CVE-2026-53642, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch