{"id":"CVE-2026-116888","kind":"vulnerability","aliases":["CVE-2026-116888"],"related":[],"title":"SemanticMediaWiki: stored XSS via unescaped property group name","description":"SemanticMediaWiki from 3.2.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows users with the smw-schemaedit right to inject markup through an unescaped property group schema canonical_name. Attackers can save a schema whose canonical_name holds script markup, which GroupFormatter renders unescaped in Special:Browse headings, executing JavaScript in viewers' sessions including administrators.","summary":"Users with the smw-schemaedit right can save a property group schema whose canonical_name contains script markup. It renders unescaped on Special:Browse, so JavaScript runs in the sessions of anyone who views that page, including administrators.","severity":"medium","cvss":4.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["mediawiki","package","self-hosted","semantic-mediawiki"],"not_affected_if":["default-config","no-smw-schemaedit-users"],"how_to_check":"- Check the installed SemanticMediaWiki version in Special:Version or composer.lock; affected range is 3.2.0 through 7.3.0.\n- Review property group schemas for canonical_name values containing HTML or script tags.","fix":"- Upgrade SemanticMediaWiki to `7.3.1` or later.\n- Until upgraded, restrict the smw-schemaedit right to trusted editors.","status":"open","published_at":"2026-10-27T11:17:31+00:00","first_seen_at":"2026-10-27T11:31:27+00:00","triaged_at":"2026-10-27T11:32:15+00:00","updated_at":"2026-10-27T11:32:15+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-27T11:32:15Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade SemanticMediaWiki to `7.3.1` or later.\n- Until upgraded, restrict the smw-schemaedit right to trusted editors.","reach":"network","title":"SemanticMediaWiki: stored XSS via unescaped property group name","impact":"medium","summary":"Users with the smw-schemaedit right can save a property group schema whose canonical_name contains script markup. It renders unescaped on Special:Browse, so JavaScript runs in the sessions of anyone who views that page, including administrators.","category":"package","nicknames":[],"who_cares":["mediawiki","semantic-mediawiki","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"Attacker script runs in admin sessions, enabling account takeover.","analyst_note":"","how_to_check":"- Check the installed SemanticMediaWiki version in Special:Version or composer.lock; affected range is 3.2.0 through 7.3.0.\n- Review property group schemas for canonical_name values containing HTML or script tags.","needs_analyst":false,"not_affected_if":["default-config","no-smw-schemaedit-users"],"who_is_affected":"Wikis running SemanticMediaWiki between 3.2.0 and 7.3.0 where some users hold the smw-schemaedit right. Exposure depends on whether untrusted or semi-trusted accounts can edit schemas, since the payload is stored and fires for every viewer of Special:Browse. Wikis where only administrators edit schemas face lower risk, and wikis without SemanticMediaWiki can skip it.","user_interaction":"yes","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000633,"input_tokens":3373,"output_tokens":591,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-116888':11A,14A '-2026':10A,13A '3.2.0':64C '7.3.1':66C 'administr':61B,120C 'allow':76C 'anyon':55B 'attack':95C 'brows':47B,112C 'canon':37B,93C,101C 'contain':39B,67C 'cross':71C 'cross-sit':70C 'cve':9A,12A 'execut':114C 'group':7A,34B,91C 'groupformatt':107C 'head':113C 'hold':103C 'host':19B 'includ':60B,119C 'inject':85C 'javascript':49B,115C 'markup':41B,86C,105C 'mediawiki':15B,22B 'name':8A,38B,94C,102C 'packag':16B 'page':59B 'properti':6A,33B,90C 'render':43B,108C 'right':29B,83C 'run':50B 'save':31B,97C 'schema':35B,92C,99C 'schemaedit':28B,82C 'script':40B,73C,104C 'self':18B 'self-host':17B 'semant':21B 'semantic-mediawiki':20B 'semanticmediawiki':1A,62C 'session':53B,118C 'site':72C 'smw':27B,81C 'smw-schemaedit':26B,80C 'special':46B,111C 'store':2A,69C 'unescap':5A,44B,89C,109C 'user':23B,77C 'via':4A 'view':57B 'viewer':117C 'vulner':74C 'whose':36B,100C 'xss':3A","nicknames":[],"mitigations":[],"who_affected":"Wikis running SemanticMediaWiki between 3.2.0 and 7.3.0 where some users hold the smw-schemaedit right. Exposure depends on whether untrusted or semi-trusted accounts can edit schemas, since the payload is stored and fires for every viewer of Special:Browse. Wikis where only administrators edit schemas face lower risk, and wikis without SemanticMediaWiki can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T11:17:31+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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-2026-116888","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116888","severity":null,"published_at":"2026-10-27T11:17:31+00:00","modified_at":"2026-10-27T11:17:31+00:00","first_seen_at":"2026-10-27T11:31:27+00:00","fetched_at":"2026-10-27T11:31:27+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}