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CVE-2026-43927

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, a race condition in the cart checkout flow allows an authenticated client to apply a promo code beyond its configured maximum uses. By sending concurrent checkout requests before any single request completes the usage increment, a client can obtain unlimited discounted or free orders from a single-use or limited-use promo code. Version 0.8.0 patches the issue. Some workarounds are available. Disable
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ce22a3a937c5ad228d5e9c8270f1a12a58530e8ccae18854ce3c62f5671f9e4d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
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:v2:2967050955bc99603ac77a28e65190274261238ce13d6212290e6d128944c92c · sha256:d00195da0f5ca3a0… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","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: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:v2:2967050955bc99603ac77a28e65190274261238ce13d6212290e6d128944c92c · sha256:d00195da0f5ca3a0… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-367","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2967050955bc99603ac77a28e65190274261238ce13d6212290e6d128944c92c · sha256:d00195da0f5ca3a0… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-w898-cx35-25gh","tags":["x_refsource_CONFIRM"],"url":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-w898-cx35-25gh"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2967050955bc99603ac77a28e65190274261238ce13d6212290e6d128944c92c · sha256:d00195da0f5ca3a0… · /containers/cna/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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