How severe is CVE-2026-23513?

CVE-2026-23513 has a CVSS 4.0 base score of 7.1, rated high severity.

Is CVE-2026-23513 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-23513?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-23513 have an EU (EUVD) identifier?

Yes. CVE-2026-23513 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38613.

When was CVE-2026-23513 published?

CVE-2026-23513 was published on 2026-06-23 and last updated on 2026-06-26.

CVE-2026-23513

CVE-2026-23513 is a high-severity vulnerability with a CVSS 4.0 base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: High (CVSS 4.0 base score 7.1)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38613
Weakness: CWE-863
Published: 2026-06-23
Last modified: 2026-06-26

Description

FOSSBilling is a free, open-source billing and client management system. In versions 0.7.2 and prior, a query-construction flaw in client list endpoints allowed authenticated clients to bypass tenant scoping and retrieve other clients’ data. Details In ServiceTransaction::getSearchQuery() and Order\Service::getSearchQuery(), OR-based search/action filters were appended without grouping, allowing SQL operator precedence to evaluate OR clauses independently of the enforced client_id constraint. Crafted requests could therefore return records and metadata belonging to other clients, including identifiers, amounts, status, timestamps, and related fields. This issue was fixed in version 0.8.0.

Frequently asked questions

What is CVE-2026-23513?: FOSSBilling is a free, open-source billing and client management system. In versions 0.7.2 and prior, a query-construction flaw in client list endpoints allowed authenticated clients to bypass tenant scoping and retrieve other clients’ data. Details In ServiceTransaction::getSearchQuery() and Order\Service::getSearchQuery(), OR-based search/action filters were appended without grouping, allowing SQL operator precedence to evaluate OR clauses independently of the enforced client_id constraint. Crafted requests could therefore return records and metadata belonging to other clients, including identifiers, amounts, status, timestamps, and related fields. This issue was fixed in version 0.8.0.
How severe is CVE-2026-23513?: CVE-2026-23513 has a CVSS 4.0 base score of 7.1, rated high severity.
Is CVE-2026-23513 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-23513?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-23513 have an EU (EUVD) identifier?: Yes. CVE-2026-23513 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38613.
When was CVE-2026-23513 published?: CVE-2026-23513 was published on 2026-06-23 and last updated on 2026-06-26.

References

Other CWE-863 (Incorrect Authorization) vulnerabilities

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