CVE-2026-43926

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Source
https://cve.org/CVERecord?id=CVE-2026-43926
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43926.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-43926
Aliases
  • GHSA-cqqm-p3x5-9fqg
Published
2026-06-04T12:46:30Z
Modified
2026-08-12T03:51:29Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
FOSSBilling's password reset confirmation endpoint lacks rate limiting
Details

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the password reset confirmation endpoint /client/reset-password-confirm/:hash is handled by a non-API controller and is not covered by FOSSBilling's rate limiter, which only applies to /api/* routes. This allows an attacker to probe the endpoint for valid reset tokens without any per-IP request limiting, attempt counting, or lockout mechanism. The endpoint acts as an oracle, returning a distinguishable response for valid versus invalid tokens (HTTP 200 vs HTTP 302 redirect). An attacker can submit unlimited token guesses to the password reset confirmation endpoint with no throttling applied. However, practical exploitability is significantly mitigated by the current token generation, which uses hash('sha256', random_bytes(32)), providing 256 bits of entropy. Tokens also expire after 15 minutes and are deleted after successful use. The same architectural gap applies to other controller-served auth routes, including /staff/email/:hash (admin password reset confirmation) and /client/confirm-email/:hash (email confirmation). Version 0.8.0 fixes the issue. Some workarounds are available. Configure a reverse proxy (e.g., Nginx, Apache, Cloudflare) to apply per-IP rate limiting to the /client/reset-password-confirm/* and /staff/email/* paths and/or use a WAF rule to limit request rates to these endpoints.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-204",
        "CWE-307"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43926.json"
}
References

Affected packages

Git / github.com/fossbilling/fossbilling

Affected ranges

Type
GIT
Repo
https://github.com/fossbilling/fossbilling
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
3bd35f5b2921d8a26a403142ae0408f95e6463cc
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.8.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

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

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43926.json"