{"id":"CVE-2026-129144","kind":"vulnerability","aliases":["CVE-2026-129144"],"related":[],"title":"paicoding: weak payment codes let users unlock paid articles free","description":"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.","summary":"paicoding 1.0.3, a Java forum and content platform, generates payment confirmation codes from a small counter. An authenticated attacker can guess a valid code and mark their own payment as paid, unlocking paywalled articles.","severity":"medium","cvss":5.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["java","other","paicoding","self-hosted"],"not_affected_if":["no-paid-content","other-version"],"how_to_check":"- Check the paicoding version in the project's pom.xml or deployment: `1.0.3` is affected per the advisory\n- Review the payment callback code path that compares verifyCode against IdUtil.genPayCode output","fix":null,"status":"open","published_at":"2026-11-13T18:17:39+00:00","first_seen_at":"2026-11-13T18:49:30+00:00","triaged_at":"2026-11-13T18:51:54+00:00","updated_at":"2026-11-13T18:51:54+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-13T18:51:54Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"internet","title":"paicoding: weak payment codes let users unlock paid articles free","impact":"medium","summary":"paicoding 1.0.3, a Java forum and content platform, generates payment confirmation codes from a small counter. An authenticated attacker can guess a valid code and mark their own payment as paid, unlocking paywalled articles.","audience":"businesses","category":"other","nicknames":[],"who_cares":["paicoding","java","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"Attacker unlocks paid articles without paying","analyst_note":"Confirm the fixed version and whether the callback is reachable unauthenticated; check the vulncheck advisory for remediation.","how_to_check":"- Check the paicoding version in the project's pom.xml or deployment: `1.0.3` is affected per the advisory\n- Review the payment callback code path that compares verifyCode against IdUtil.genPayCode output","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-paid-content","other-version"],"who_is_affected":"Sites running paicoding 1.0.3 that sell paid articles or memberships are exposed, because the payment confirmation code can be guessed. The attacker needs a user account. Sites that do not use paid content or the payment callback are not affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000716,"input_tokens":4601,"output_tokens":511,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-129144':13A,16A '-2026':12A,15A '1.0.3':24B,58C '2000':85C 'allow':65C 'articl':9A,56B,71C 'attack':41B,67C,78C 'authent':40B,66C 'bypass':62C 'callback':97C 'code':4A,34B,46B,77C 'confirm':33B,76C 'contain':59C 'content':29B 'counter':38B,87C 'cve':11A,14A 'enumer':83C 'forum':27B 'free':10A 'generat':31B 'guess':43B,73C 'host':22B 'idutil.genpaycode':86C 'java':17B,26B 'let':5A 'mark':48B,99C 'match':92C 'paicod':1A,19B,23B,57C 'paid':8A,53B,70C,101C 'payment':3A,32B,51B,61C,75C,82C 'paywal':55B 'platform':30B 'rough':84C 'self':21B 'self-host':20B 'small':37B 'start':80C 'submit':90C 'unauthent':96C 'unlock':7A,54B,69C 'user':6A 'valid':45B 'valu':88C 'verifycod':93C 'vulner':63C 'weak':2A,74C","nicknames":[],"mitigations":[],"who_affected":"Sites running paicoding 1.0.3 that sell paid articles or memberships are exposed, because the payment confirmation code can be guessed. The attacker needs a user account. Sites that do not use paid content or the payment callback are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["java","medium","other","paicoding","selfhosted"],"campaign_type":null,"search_a":"'-129144':13A,16A '-2026':12A,15A 'articl':9A 'code':4A 'cve':11A,14A 'free':10A 'let':5A 'paicod':1A 'paid':8A 'payment':3A 'unlock':7A 'user':6A 'weak':2A","search_b":"'1.0.3':24B 'articl':56B 'attack':41B 'authent':40B 'code':34B,46B 'confirm':33B 'content':29B 'counter':38B 'forum':27B 'generat':31B 'guess':43B 'host':22B 'java':17B,26B 'mark':48B 'paicod':19B,23B 'paid':53B 'payment':32B,51B 'paywal':55B 'platform':30B 'self':21B 'self-host':20B 'small':37B 'unlock':54B 'valid':45B","search_c":"'1.0.3':58C '2000':85C 'allow':65C 'articl':71C 'attack':67C,78C 'authent':66C 'bypass':62C 'callback':97C 'code':77C 'confirm':76C 'contain':59C 'counter':87C 'enumer':83C 'guess':73C 'idutil.genpaycode':86C 'mark':99C 'match':92C 'paicod':57C 'paid':70C,101C 'payment':61C,75C,82C 'rough':84C 'start':80C 'submit':90C 'unauthent':96C 'unlock':69C 'valu':88C 'verifycod':93C 'vulner':63C 'weak':74C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T18:17:39+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-129144","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-129144","severity":null,"published_at":"2026-11-13T18:17:39+00:00","modified_at":"2026-11-13T18:17:39+00:00","first_seen_at":"2026-11-13T18:49:30+00:00","fetched_at":"2026-11-13T18:49:30+00:00","note":null}],"documents":[{"id":148608,"url":"https://www.vulncheck.com/advisories/paicoding-1.0.3-payment-bypass-via-guessable-codes-in-article-api-pay-callback","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}