{"id":"CVE-2026-105607","kind":"vulnerability","aliases":["CVE-2026-105607"],"related":[],"title":"Joomla Gridbox extension: unauthenticated stored XSS via Recent Comments widget","description":"Joomla Extension - balbooa.com - Unauthenticated stored XSS in the \"Recent Comments / Recent Reviews\" widget in Gridbox < 2.20.5.0","summary":"The Gridbox extension for Joomla has a stored cross-site scripting flaw in its Recent Comments / Recent Reviews widget. An unauthenticated visitor can plant script that runs in other users' browsers when the widget renders.","severity":"high","cvss":8.6,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["gridbox","joomla","package","self-hosted","wordpress-alternative"],"not_affected_if":["gridbox-not-installed","version-2.20.5.0-or-later","widget-not-used"],"how_to_check":"- Check the installed Gridbox extension version in the Joomla administrator under Extensions > Manage, comparing against `2.20.5.0`","fix":"- Gridbox: move to `2.20.5.0` or later","status":"open","published_at":"2026-11-05T18:16:59+00:00","first_seen_at":"2026-11-05T18:40:09+00:00","triaged_at":"2026-11-05T18:40:24+00:00","updated_at":"2026-11-05T18:40:24+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-05T18:40:24Z","model":"claude-haiku-5-5","output":{"fix":"- Gridbox: move to `2.20.5.0` or later","reach":"internet","title":"Joomla Gridbox extension: unauthenticated stored XSS via Recent Comments widget","impact":"medium","summary":"The Gridbox extension for Joomla has a stored cross-site scripting flaw in its Recent Comments / Recent Reviews widget. An unauthenticated visitor can plant script that runs in other users' browsers when the widget renders.","audience":"businesses","category":"package","nicknames":[],"who_cares":["joomla","gridbox","self-hosted","wordpress-alternative"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Attacker script runs in visitors' and admins' browsers on the site","analyst_note":"","how_to_check":"- Check the installed Gridbox extension version in the Joomla administrator under Extensions > Manage, comparing against `2.20.5.0`\n- unknown for any other check","plain_action":"","needs_analyst":false,"not_affected_if":["gridbox-not-installed","widget-not-used","version-2.20.5.0-or-later"],"who_is_affected":"Joomla sites running the Gridbox extension earlier than 2.20.5.0 that display the Recent Comments / Recent Reviews widget. Sites without Gridbox or without that widget in use are not affected by this flaw; unknown whether other Gridbox components are involved.","user_interaction":"yes","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000686,"input_tokens":4198,"output_tokens":532,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-105607':13A,16A '-2026':12A,15A '2.20.5.0':77C 'altern':25B 'balbooa.com':64C 'browser':57B 'comment':9A,42B,71C 'cross':35B 'cross-sit':34B 'cve':11A,14A 'extens':3A,28B,63C 'flaw':38B 'gridbox':2A,17B,27B,76C 'host':22B 'joomla':1A,18B,30B,62C 'packag':19B 'plant':50B 'recent':8A,41B,43B,70C,72C 'render':61B 'review':44B,73C 'run':53B 'script':37B,51B 'self':21B 'self-host':20B 'site':36B 'store':5A,33B,66C 'unauthent':4A,47B,65C 'user':56B 'via':7A 'visitor':48B 'widget':10A,45B,60B,74C 'wordpress':24B 'wordpress-altern':23B 'xss':6A,67C","nicknames":[],"mitigations":[],"who_affected":"Joomla sites running the Gridbox extension earlier than 2.20.5.0 that display the Recent Comments / Recent Reviews widget. Sites without Gridbox or without that widget in use are not affected by this flaw; unknown whether other Gridbox components are involved.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["gridbox","high","joomla","package","selfhosted","wordpressalternative"],"campaign_type":null,"first_public_at":"2026-11-05T18:16:59+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/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":"security@joomla.org","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-105607","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105607","severity":null,"published_at":"2026-11-05T18:16:59+00:00","modified_at":"2026-11-05T18:16:59+00:00","first_seen_at":"2026-11-05T18:40:09+00:00","fetched_at":"2026-11-05T18:40:09+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}