CVSS 4.0
5.3 mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:NCVE-2026-129144 paicoding 1.0.3 Payment Bypass via Guessable Codes in /article/api/pay/callback
Medium (5.3) in itwanger paicoding.
paicoding 1.0.3 contains a payment bypass vulnerability that allows authenticated attackers to unlock paid articles by guessing weak payment confirmation codes. Attackers can start a payment, enumerate roughly 2000 IdUtil.genPayCode counter values, and submit the matching verifyCode to the unauthenticated callback to mark it paid.
Severity
CVSS 3.1
5.4 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N- CWE
- CWE-334 Small Space of Random Values
- OWASP Top 10
- A04:2025 Cryptographic Failures
- Published
- Assigned by
- VulnCheck (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| itwanger paicoding | 1.0.3 |
References
- https://github.com/itwanger/paicoding/blob/903adce70309d340f7eec51ec3c80cfe3c8326c1/paicoding-core/src/main/java/com/github/paicoding/forum/core/util/id/IdUtil.java#L54-L61
- https://github.com/itwanger/paicoding/blob/903adce70309d340f7eec51ec3c80cfe3c8326c1/paicoding-web/src/main/java/com/github/paicoding/forum/web/front/article/rest/ArticlePayRestController.java#L79-L90
- https://github.com/itwanger/paicoding/issues/137
- https://vul.yulun.ac.cn/20261112/paicoding/
- https://www.vulncheck.com/advisories/paicoding-1.0.3-payment-bypass-via-guessable-codes-in-article-api-pay-callback