{"id":"CVE-2026-124474","kind":"vulnerability","aliases":["CVE-2026-124474"],"related":[],"title":"MRBS: reflected cross-site scripting in view_entry.php lets attackers run scripts","description":"MRBS (Meeting Room Booking System) before 1.12.3 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject script via the error parameter of view_entry.php. Attackers can send crafted links to logged-in users to read CSRF tokens, modify or delete bookings, or perform administrative actions.","summary":"MRBS, a meeting room booking system, versions before 1.12.3 reflect the error parameter of view_entry.php without escaping it. An attacker who tricks a logged-in user into opening a crafted link can run script in that user's session, read CSRF tokens, and modify or delete bookings or perform administrative actions.","severity":"medium","cvss":6.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["mrbs","other","php","self-hosted"],"not_affected_if":["mrbs-1.12.3-or-later"],"how_to_check":"- Check the installed MRBS version and confirm whether it is below `1.12.3`.\n- Search web server logs for requests to `view_entry.php` containing `error=` with script or HTML characters.","fix":"- MRBS: upgrade to `1.12.3` or later (patch and release notes linked from the NVD entry).","status":"open","published_at":"2026-11-08T14:18:16+00:00","first_seen_at":"2026-11-08T14:48:40+00:00","triaged_at":"2026-11-08T14:50:57+00:00","updated_at":"2026-11-08T14:50:57+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-08T14:50:57Z","model":"claude-haiku-5-5","output":{"fix":"- MRBS: upgrade to `1.12.3` or later (patch and release notes linked from the NVD entry).","reach":"internet","title":"MRBS: reflected cross-site scripting in view_entry.php lets attackers run scripts","impact":"medium","summary":"MRBS, a meeting room booking system, versions before 1.12.3 reflect the error parameter of view_entry.php without escaping it. An attacker who tricks a logged-in user into opening a crafted link can run script in that user's session, read CSRF tokens, and modify or delete bookings or perform administrative actions.","audience":"businesses","category":"other","nicknames":[],"who_cares":["mrbs","self-hosted","php"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"script runs in a logged-in user's session, enabling booking changes and admin actions","analyst_note":"Confirm the affected version range and whether admin-only pages are reachable from the internet.","how_to_check":"- Check the installed MRBS version and confirm whether it is below `1.12.3`.\n- Search web server logs for requests to `view_entry.php` containing `error=` with script or HTML characters.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["mrbs-1.12.3-or-later"],"who_is_affected":"Any installation of MRBS before 1.12.3 that is reachable by staff or users who log in. Exposure depends on whether logged-in users can be lured to a crafted link; the sources do not say whether any non-default configuration is required.","user_interaction":"yes","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00075,"input_tokens":4644,"output_tokens":571,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-124474':15A,18A '-2026':14A,17A '1.12.3':33B,83C 'action':76B,126C 'administr':75B,125C 'allow':93C 'attack':10A,44B,95C,105C 'book':29B,72B,80C,122C 'contain':84C 'craft':55B,108C 'cross':4A,88C 'cross-sit':3A,87C 'csrf':66B,117C 'cve':13A,16A 'delet':71B,121C 'error':36B,101C 'escap':41B 'host':24B 'inject':97C 'let':9A 'link':56B,109C 'log':49B,112C 'logged-in':48B,111C 'meet':27B,78C 'modifi':69B,119C 'mrbs':1A,19B,25B,77C 'open':53B 'paramet':37B,102C 'perform':74B,124C 'php':21B 'read':65B,116C 'reflect':2A,34B,86C 'room':28B,79C 'run':11A,58B 'script':6A,12A,59B,90C,98C 'self':23B 'self-host':22B 'send':107C 'session':64B 'site':5A,89C 'system':30B,81C 'token':67B,118C 'trick':46B 'unauthent':94C 'user':51B,62B,114C 'version':31B 'via':99C 'view_entry.php':8A,39B,104C 'vulner':91C 'without':40B","nicknames":[],"mitigations":[],"who_affected":"Any installation of MRBS before 1.12.3 that is reachable by staff or users who log in. Exposure depends on whether logged-in users can be lured to a crafted link; the sources do not say whether any non-default configuration is required.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","mrbs","other","php","selfhosted"],"campaign_type":null,"search_a":"'-124474':15A,18A '-2026':14A,17A 'attack':10A 'cross':4A 'cross-sit':3A 'cve':13A,16A 'let':9A 'mrbs':1A 'reflect':2A 'run':11A 'script':6A,12A 'site':5A 'view_entry.php':8A","search_b":"'1.12.3':33B 'action':76B 'administr':75B 'attack':44B 'book':29B,72B 'craft':55B 'csrf':66B 'delet':71B 'error':36B 'escap':41B 'host':24B 'link':56B 'log':49B 'logged-in':48B 'meet':27B 'modifi':69B 'mrbs':19B,25B 'open':53B 'paramet':37B 'perform':74B 'php':21B 'read':65B 'reflect':34B 'room':28B 'run':58B 'script':59B 'self':23B 'self-host':22B 'session':64B 'system':30B 'token':67B 'trick':46B 'user':51B,62B 'version':31B 'view_entry.php':39B 'without':40B","search_c":"'1.12.3':83C 'action':126C 'administr':125C 'allow':93C 'attack':95C,105C 'book':80C,122C 'contain':84C 'craft':108C 'cross':88C 'cross-sit':87C 'csrf':117C 'delet':121C 'error':101C 'inject':97C 'link':109C 'log':112C 'logged-in':111C 'meet':78C 'modifi':119C 'mrbs':77C 'paramet':102C 'perform':124C 'read':116C 'reflect':86C 'room':79C 'script':90C,98C 'send':107C 'site':89C 'system':81C 'token':118C 'unauthent':94C 'user':114C 'via':99C 'view_entry.php':104C 'vulner':91C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-07T18:16:51+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-2026-124474","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124474","severity":null,"published_at":"2026-11-08T14:18:16+00:00","modified_at":"2026-11-08T14:18:16+00:00","first_seen_at":"2026-11-08T14:48:40+00:00","fetched_at":"2026-11-08T14:48:40+00:00","note":null}],"documents":[{"id":102134,"url":"https://github.com/meeting-room-booking-system/mrbs-code/commit/83b8253853359964f850208c28036b2bfa202466","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":102135,"url":"https://github.com/meeting-room-booking-system/mrbs-code/releases/tag/v1.12.3","title":"Release notes: github.com","kind":"release","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Release notes: github.com"},{"id":102136,"url":"https://github.com/meeting-room-booking-system/mrbs-code/security/advisories/GHSA-5wqw-q7gh-j65v","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-11-07T18:16:51+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":102137,"url":"https://www.vulncheck.com/advisories/mrbs-before-1.12.3-reflected-xss-via-error-parameter-of-view-entry-php","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}