{"id":"CVE-2026-116887","kind":"vulnerability","aliases":["CVE-2026-116887"],"related":[],"title":"Semantic MediaWiki: stored XSS via Keyword properties on Special:Browse","description":"Semantic MediaWiki from 3.0.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows users with page-edit rights to inject HTML through Keyword-typed property values rendered unescaped on Special:Browse. Attackers can annotate a Keyword property with an event-handler payload that executes JavaScript in viewers' sessions, including administrators, to read tokens and perform actions.","summary":"Semantic MediaWiki versions 3.0.0 through 7.3.0 render Keyword-typed property values unescaped on Special:Browse. A user with page-edit rights can store an event-handler payload that runs JavaScript in other viewers' sessions, including administrators.","severity":"medium","cvss":5.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["mediawiki","package","self-hosted","semantic-mediawiki"],"not_affected_if":["edit-rights-restricted-to-trusted-users","extension-not-installed","version-7.3.1-or-later"],"how_to_check":"- Check the installed Semantic MediaWiki version in Special:Version or in the extension's composer.json / extension.json\n- Look for an installed version below `7.3.1` (unknown whether the sources give a specific check beyond this)","fix":"- Upgrade Semantic MediaWiki to `7.3.1` or later\n- Until upgraded, restrict page-edit rights to trusted users (unknown whether the sources list a workaround)","status":"open","published_at":"2026-10-27T11:17:31+00:00","first_seen_at":"2026-10-27T11:31:27+00:00","triaged_at":"2026-10-27T11:32:11+00:00","updated_at":"2026-10-27T11:32:11+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-27T11:32:11Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Semantic MediaWiki to `7.3.1` or later\n- Until upgraded, restrict page-edit rights to trusted users (unknown whether the sources list a workaround)","reach":"internet","title":"Semantic MediaWiki: stored XSS via Keyword properties on Special:Browse","impact":"high","summary":"Semantic MediaWiki versions 3.0.0 through 7.3.0 render Keyword-typed property values unescaped on Special:Browse. A user with page-edit rights can store an event-handler payload that runs JavaScript in other viewers' sessions, including administrators.","category":"package","nicknames":[],"who_cares":["mediawiki","semantic-mediawiki","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"Attacker runs JavaScript in admin sessions and steals tokens","analyst_note":"Confirm the exact affected range and whether a workaround exists; check the upstream advisory linked from the NVD entry.","how_to_check":"- Check the installed Semantic MediaWiki version in Special:Version or in the extension's composer.json / extension.json\n- Look for an installed version below `7.3.1` (unknown whether the sources give a specific check beyond this)","needs_analyst":true,"not_affected_if":["version-7.3.1-or-later","extension-not-installed","edit-rights-restricted-to-trusted-users"],"who_is_affected":"Wikis running Semantic MediaWiki from 3.0.0 before 7.3.1 are exposed. The risk is greatest where many users can edit pages and administrators browse Special:Browse, since the payload executes in their sessions. Wikis without the extension, or on 7.3.1 or later, are not affected.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000658,"input_tokens":3368,"output_tokens":642,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-116887':13A,16A '-2026':12A,15A '3.0.0':28B,67C '7.3.0':30B '7.3.1':69C 'action':125C 'administr':63B,119C 'allow':79C 'annot':102C 'attack':100C 'brows':10A,40B,99C 'contain':70C 'cross':74C 'cross-sit':73C 'cve':11A,14A 'edit':46B,84C 'event':52B,109C 'event-handl':51B,108C 'execut':113C 'handler':53B,110C 'host':21B 'html':88C 'includ':62B,118C 'inject':87C 'javascript':57B,114C 'keyword':6A,33B,91C,104C 'keyword-typ':32B,90C 'mediawiki':2A,17B,24B,26B,65C 'packag':18B 'page':45B,83C 'page-edit':44B,82C 'payload':54B,111C 'perform':124C 'properti':7A,35B,93C,105C 'read':121C 'render':31B,95C 'right':47B,85C 'run':56B 'script':76C 'self':20B 'self-host':19B 'semant':1A,23B,25B,64C 'semantic-mediawiki':22B 'session':61B,117C 'site':75C 'special':9A,39B,98C 'store':3A,49B,72C 'token':122C 'type':34B,92C 'unescap':37B,96C 'user':42B,80C 'valu':36B,94C 'version':27B 'via':5A 'viewer':60B,116C 'vulner':77C 'xss':4A","nicknames":[],"mitigations":[],"who_affected":"Wikis running Semantic MediaWiki from 3.0.0 before 7.3.1 are exposed. The risk is greatest where many users can edit pages and administrators browse Special:Browse, since the payload executes in their sessions. Wikis without the extension, or on 7.3.1 or later, are not affected.","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:N/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-2026-116887","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116887","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"}