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CVE-2026-42331

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the Guest API invoice/update endpoint is missing an authorization check present in other invoice-related endpoints, allowing an unauthenticated user with knowledge of an invoice hash to modify the payment gateway associated with an unpaid invoice. An attacker who obtains an invoice hash, which may leak through shared URLs, referrer headers, or email links, can change the `gateway_id` on an unpaid in
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:abca43824c26d41ce502d5591dd044a2660ce1f5eb96c98e9949758ed3a1e3a5
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f9fd7810368bc286b2c870347a8492735e382da91163b9806b1b59d6005a3b9f · sha256:a3f75dfb2686aee9… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f9fd7810368bc286b2c870347a8492735e382da91163b9806b1b59d6005a3b9f · sha256:a3f75dfb2686aee9… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"FOSSBilling","vendor":"FOSSBilling","versions":[{"status":"affected","version":"< 0.8.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f9fd7810368bc286b2c870347a8492735e382da91163b9806b1b59d6005a3b9f · sha256:a3f75dfb2686aee9… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:H/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f9fd7810368bc286b2c870347a8492735e382da91163b9806b1b59d6005a3b9f · sha256:a3f75dfb2686aee9… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f9fd7810368bc286b2c870347a8492735e382da91163b9806b1b59d6005a3b9f · sha256:a3f75dfb2686aee9… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f9fd7810368bc286b2c870347a8492735e382da91163b9806b1b59d6005a3b9f · sha256:a3f75dfb2686aee9… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-8755-w77f-3g7j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-8755-w77f-3g7j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f9fd7810368bc286b2c870347a8492735e382da91163b9806b1b59d6005a3b9f · sha256:a3f75dfb2686aee9… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-8755-w77f-3g7j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f9fd7810368bc286b2c870347a8492735e382da91163b9806b1b59d6005a3b9f · sha256:a3f75dfb2686aee9… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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