CVE-2026-111056

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Source
https://cve.org/CVERecord?id=CVE-2026-111056
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111056.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-111056
Aliases
  • GHSA-x4mh-g4pc-wfc5
Published
2026-10-19T16:00:57Z
Modified
2026-10-20T02:44:33Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
FOSSBilling: Unauthenticated client account enumeration via guest signup endpoint
Details

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/create endpoint reveals whether a submitted email belongs to a registered client because guest signup returns a distinct unredacted error when the submitted email already exists. The trigger is an unauthenticated request to POST /api/guest/client/create with a target email address. An attacker can compare the guest-signup response for a target email to determine whether the email belongs to an existing FOSSBilling client. Box\Mod\Client\Api\Guest::create returns the error after Client\Service::clientAlreadyExists finds a matching record, and the API response exposes that exception message without redaction. This issue is fixed in version 0.8.7.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-200",
        "CWE-204",
        "CWE-307"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111056.json"
}
References

Affected packages

Git / github.com/fossbilling/fossbilling

Affected ranges

Type
GIT
Repo
https://github.com/fossbilling/fossbilling
Events
Introduced
469046158e66d47fa4976703657016961abff3a1
Fixed
29cd19d8793747e86b59a033688e5b9b83de8fab
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0.1.0"
        },
        {
            "fixed":  "0.8.7"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

0.*
0.1.0
0.1.1
0.2.0
0.2.1
0.2.10
0.2.2
0.2.3
0.2.4
0.2.5
0.2.6
0.2.7
0.2.8
0.2.9
0.3.0
0.4.0
0.4.1
0.4.2
0.4.3
0.5.0
0.5.1
0.5.2
0.5.3
0.5.4
0.5.5
0.6.0
0.6.1
0.6.10
0.6.11
0.6.12
0.6.13
0.6.14
0.6.15
0.6.16
0.6.17
0.6.18
0.6.19
0.6.2
0.6.20
0.6.21
0.6.22
0.6.3
0.6.4
0.6.5
0.6.6
0.6.7
0.6.8
0.6.9
0.7.0
0.7.1
0.7.2
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.8.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111056.json"