{"id":"CVE-2026-116881","kind":"vulnerability","aliases":["CVE-2026-116881"],"related":[],"title":"Semantic MediaWiki: stored XSS in property autocomplete dropdown","description":"Semantic MediaWiki from 3.0.0 before 7.3.1 contains a cross-site scripting vulnerability that allows attackers to inject markup by storing malicious semantic property values rendered unescaped in autocomplete suggestions. When another user opens the property-value autocomplete with an empty query, jquery.autocomplete.js concatenates the raw PValueLookup API value into HTML via container.html(), altering the dropdown and potentially executing script.","summary":"Semantic MediaWiki from 3.0.0 before 7.3.1 renders stored semantic property values unescaped in the property-value autocomplete dropdown. When another user opens that autocomplete with an empty query, injected markup or script can run in their browser.","severity":"medium","cvss":6.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["mediawiki","package","self-hosted","semantic-mediawiki"],"not_affected_if":["version-7.3.1-or-later"],"how_to_check":"- Check the installed Semantic MediaWiki version in Special:Version or the `composer.lock` entry for `mediawiki/semantic-media-wiki`; versions from `3.0.0` up to but not including `7.3.1` are affected.","fix":"- Upgrade Semantic MediaWiki to `7.3.1` or later.","status":"open","published_at":"2026-10-27T11:17:30+00:00","first_seen_at":"2026-10-27T11:31:27+00:00","triaged_at":"2026-10-27T11:32:06+00:00","updated_at":"2026-10-27T11:32:06+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-27T11:32:06Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Semantic MediaWiki to `7.3.1` or later.","reach":"internet","title":"Semantic MediaWiki: stored XSS in property autocomplete dropdown","impact":"medium","summary":"Semantic MediaWiki from 3.0.0 before 7.3.1 renders stored semantic property values unescaped in the property-value autocomplete dropdown. When another user opens that autocomplete with an empty query, injected markup or script can run in their browser.","category":"package","nicknames":[],"who_cares":["mediawiki","semantic-mediawiki","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"Script runs in other users' browsers, enabling session theft or actions as them","analyst_note":"","how_to_check":"- Check the installed Semantic MediaWiki version in Special:Version or the `composer.lock` entry for `mediawiki/semantic-media-wiki`; versions from `3.0.0` up to but not including `7.3.1` are affected.","needs_analyst":false,"not_affected_if":["version-7.3.1-or-later"],"who_is_affected":"Wikis running Semantic MediaWiki between 3.0.0 and 7.3.1 are exposed when users can store semantic property values, which lets an attacker plant a payload that other editors trigger by opening the property-value autocomplete. Wikis where only trusted editors can write semantic annotations carry less risk. Sites on versions 7.3.1 or later are not affected.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000615,"input_tokens":3381,"output_tokens":554,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-116881':11A,14A '-2026':10A,13A '3.0.0':26B,64C '7.3.1':28B,66C 'allow':75C 'alter':115C 'anoth':43B,92C 'api':109C 'attack':76C 'autocomplet':7A,40B,47B,89C,99C 'browser':60B 'concaten':105C 'contain':67C 'container.html':114C 'cross':70C 'cross-sit':69C 'cve':9A,12A 'dropdown':8A,41B,117C 'empti':50B,102C 'execut':120C 'host':19B 'html':112C 'inject':52B,78C 'jquery.autocomplete.js':104C 'malici':82C 'markup':53B,79C 'mediawiki':2A,15B,22B,24B,62C 'open':45B,94C 'packag':16B 'potenti':119C 'properti':6A,32B,38B,84C,97C 'property-valu':37B,96C 'pvaluelookup':108C 'queri':51B,103C 'raw':107C 'render':29B,86C 'run':57B 'script':55B,72C,121C 'self':18B 'self-host':17B 'semant':1A,21B,23B,31B,61C,83C 'semantic-mediawiki':20B 'site':71C 'store':3A,30B,81C 'suggest':90C 'unescap':34B,87C 'user':44B,93C 'valu':33B,39B,85C,98C,110C 'via':113C 'vulner':73C 'xss':4A","nicknames":[],"mitigations":[],"who_affected":"Wikis running Semantic MediaWiki between 3.0.0 and 7.3.1 are exposed when users can store semantic property values, which lets an attacker plant a payload that other editors trigger by opening the property-value autocomplete. Wikis where only trusted editors can write semantic annotations carry less risk. Sites on versions 7.3.1 or later are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T11:17:30+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-2026-116881","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116881","severity":null,"published_at":"2026-10-27T11:17:30+00:00","modified_at":"2026-10-27T11:17:30+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"}