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CVE-2026-43928

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the PayPalEmail payment adapter accepts PayPal IPN callbacks and credits the IPN-supplied amount (`mc_gross`) to the client's balance without validating it against the invoice total. Combined with a $0.05 floating-point epsilon tolerance in the invoice credit-payment logic, this allows a client to underpay an invoice by up to $0.04 and still have it marked as fully paid. Version 0.8.0 patches the iss
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3c26d568a61e265590510361b773d561dab74633e03b1d0b72b9bd4cedd29b55
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-754","description":"CWE-754: Improper Check for Unusual or Exceptional Conditions","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8e17c5dd25df8fdb250f8e4656c9a2bf7fe394071709bbff89927103f8a0faa9 · sha256:2699bffcbaaa85ea… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-1284","description":"CWE-1284: Improper Validation of Specified Quantity in Input","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8e17c5dd25df8fdb250f8e4656c9a2bf7fe394071709bbff89927103f8a0faa9 · sha256:2699bffcbaaa85ea… · /containers/cna/problemTypes/1/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:v2:8e17c5dd25df8fdb250f8e4656c9a2bf7fe394071709bbff89927103f8a0faa9 · sha256:2699bffcbaaa85ea… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8e17c5dd25df8fdb250f8e4656c9a2bf7fe394071709bbff89927103f8a0faa9 · sha256:2699bffcbaaa85ea… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-754","description":"CWE-754: Improper Check for Unusual or Exceptional Conditions","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8e17c5dd25df8fdb250f8e4656c9a2bf7fe394071709bbff89927103f8a0faa9 · sha256:2699bffcbaaa85ea… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-1284","description":"CWE-1284: Improper Validation of Specified Quantity in Input","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8e17c5dd25df8fdb250f8e4656c9a2bf7fe394071709bbff89927103f8a0faa9 · sha256:2699bffcbaaa85ea… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-xjc6-g382-h942","tags":["x_refsource_CONFIRM"],"url":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-xjc6-g382-h942"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8e17c5dd25df8fdb250f8e4656c9a2bf7fe394071709bbff89927103f8a0faa9 · sha256:2699bffcbaaa85ea… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-xjc6-g382-h942"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8e17c5dd25df8fdb250f8e4656c9a2bf7fe394071709bbff89927103f8a0faa9 · sha256:2699bffcbaaa85ea… · /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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