{"id":"CVE-2023-43770","kind":"vulnerability","aliases":["CVE-2023-43770"],"related":[],"title":"Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with…","description":"Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that can lead to information disclosure via malicious link references in plain/text messages.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"Roundcube Webmail has a persistent cross-site scripting flaw triggered by malicious link references in plain-text email messages. An attacker who sends such an email can run script in a victim's webmail session and read information from it.","severity":"high","cvss":6.1,"epss":null,"exploited":true,"exploited_at":"2024-02-12T00:00:00+00:00","products":[{"name":"roundcube webmail","fixed":["1.4.14"],"affected":"< 1.4.14","ecosystem":"vendor"},{"name":"roundcube webmail","fixed":["1.5.4"],"affected":">= 1.5.0, < 1.5.4","ecosystem":"vendor"},{"name":"roundcube webmail","fixed":["1.6.3"],"affected":">= 1.6.0, < 1.6.3","ecosystem":"vendor"},{"name":"debian linux","fixed":[],"affected":"= 10.0","ecosystem":"vendor"},{"name":"Roundcube Webmail","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","package","roundcube","self-hosted","webmail"],"not_affected_if":["not-roundcube"],"how_to_check":null,"fix":"Apply the vendor mitigation per Roundcube's advisory, or discontinue use of Roundcube if mitigations are unavailable (per CISA KEV required action). Fixed version: unknown","status":"open","published_at":"2023-09-22T06:15:10+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T21:02:23+00:00","updated_at":"2026-10-24T00:09:51+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-23T21:02:23Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor mitigation per Roundcube's advisory, or discontinue use of Roundcube if mitigations are unavailable (per CISA KEV required action). Fixed version: unknown","reach":"internet","impact":"medium","summary":"Roundcube Webmail has a persistent cross-site scripting flaw triggered by malicious link references in plain-text email messages. An attacker who sends such an email can run script in a victim's webmail session and read information from it.","category":"package","who_cares":["roundcube","self-hosted","webmail"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker script runs in victim's webmail session and discloses mailbox information.","analyst_note":"Confirm affected and fixed versions and the exact vendor mitigation from the Roundcube security advisory for CVE-2023-43770; sources did not list them.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["not-roundcube"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000468,"input_tokens":2829,"output_tokens":371,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2023':22A,25A '-43770':23A,26A '1.4.14':3A '1.5':4A '1.5.4':7A '1.6':9A '1.6.3':12A 'action':110C 'allow':13A 'appli':111C 'attack':66B 'cisa':108C 'contain':86C 'cross':50B,90C 'cross-sit':49B,89C 'cve':21A,24A 'debian':33A 'disclosur':100C 'discontinu':117C 'e':18A 'e-mail':17A 'email':63B,71B 'exploit':37B 'flaw':53B 'host':42B 'inform':83B,99C 'instruct':115C 'lead':97C 'link':57B,103C 'linux':34A 'mail':19A 'malici':56B,102C 'messag':20A,64B,107C 'mitig':112C,123C 'packag':38B 'per':113C 'persist':48B,88C 'plain':61B 'plain-text':60B 'plain/text':106C 'product':121C 'read':82B 'refer':58B,104C 'requir':109C 'roundcub':1A,39B,44B,84C 'roundcube':27A,29A,31A,35A 'run':73B 'script':52B,74B,92C 'self':41B 'self-host':40B 'send':68B 'session':80B 'site':51B,91C 'text':62B 'text/plain':16A 'trigger':54B 'unavail':125C 'use':118C 'vendor':114C 'via':15A,101C 'victim':77B 'vulner':94C 'webmail':28A,30A,32A,36A,43B,45B,79B,85C 'x':5A,10A 'xss':14A,93C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2023-09-22T06:15:10+00:00","kev":{"dateAdded":"2024-02-12","dueDate":"2024-03-04","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2023-43770","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-43770","severity":null,"published_at":"2024-02-12T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T12:39:22+00:00","note":null},{"source":"nvd","external_id":"CVE-2023-43770","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43770","severity":null,"published_at":"2023-09-22T06:15:10+00:00","modified_at":"2026-06-17T06:26:24+00:00","first_seen_at":"2026-10-23T22:29:05+00:00","fetched_at":"2026-10-23T22:29:05+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"}