{"id":"CVE-2026-78190","kind":"vulnerability","aliases":["CVE-2026-78190"],"related":[],"title":"WebDyne Perl: request parameters reflected unescaped into form fields enable XSS","description":"WebDyne versions from 2.014 before 3.022 for Perl reflect request parameters unescaped into form field values, allowing cross-site scripting.\n\nThe textfield, password_field and filefield tags fill their value attribute from the request parameter of the same name. WEBDYNE_CGI_AUTOESCAPE, which controls escaping of these values, defaults to off. From 2.022, WebDyne::HTML::Tiny also replaced its entity_encode method with one that returns its input unchanged, so enabling WEBDYNE_CGI_AUTOESCAPE has no effect.\n\nA remote attacker can inject script into any page using these tags through a crafted link.","summary":"WebDyne, a Perl web framework, copies request parameters unescaped into form field value attributes in its textfield, password_field and filefield tags. An attacker can use a crafted link to inject script that runs in the victim's browser on affected pages.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","perl","web-apps","webdyne"],"not_affected_if":["no-request-params-in-form-tags","static-content-only"],"how_to_check":"- Check the installed WebDyne version with `perl -MWebDyne -e 'print $WebDyne::VERSION'` or the module's version in your cpanfile or lockfile; versions from 2.014 before 3.022 are affected.\n- Search your templates for `textfield`, `password_field` or `filefield` tags that take request parameters.\n- Check whether `WEBDYNE_CGI_AUTOESCAPE` is set in your configuration; the default is off and enabling it does not help from 2.022 on.","fix":"- WebDyne: move to `3.022` or later (the sources state the fixed version is 3.022).","status":"open","published_at":"2026-10-31T15:16:54+00:00","first_seen_at":"2026-10-31T15:36:19+00:00","triaged_at":"2026-10-31T15:36:40+00:00","updated_at":"2026-10-31T15:36:40+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-31T15:36:40Z","model":"claude-haiku-5-5","output":{"fix":"- WebDyne: move to `3.022` or later (the sources state the fixed version is 3.022).","reach":"internet","title":"WebDyne Perl: request parameters reflected unescaped into form fields enable XSS","impact":"medium","summary":"WebDyne, a Perl web framework, copies request parameters unescaped into form field value attributes in its textfield, password_field and filefield tags. An attacker can use a crafted link to inject script that runs in the victim's browser on affected pages.","audience":"businesses","category":"package","nicknames":[],"who_cares":["perl","webdyne","web-apps"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker script runs in victims' browsers on affected pages","analyst_note":"Confirm the affected version range and whether any setting mitigates on 2.022+ via the NVD entry and the WebDyne project changelog.","how_to_check":"- Check the installed WebDyne version with `perl -MWebDyne -e 'print $WebDyne::VERSION'` or the module's version in your cpanfile or lockfile; versions from 2.014 before 3.022 are affected.\n- Search your templates for `textfield`, `password_field` or `filefield` tags that take request parameters.\n- Check whether `WEBDYNE_CGI_AUTOESCAPE` is set in your configuration; the default is off and enabling it does not help from 2.022 on.","plain_action":"","needs_analyst":true,"not_affected_if":["static-content-only","no-request-params-in-form-tags"],"who_is_affected":"Applications built on WebDyne that render form tags from request parameters are exposed, since the reflected value reaches the page unescaped. Sites that do not use these tags with user-supplied input, or that run only static content, are less exposed. The sources do not say whether WEBDYNE_CGI_AUTOESCAPE offers any protection on versions 2.022 and later.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000775,"input_tokens":4239,"output_tokens":702,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-78190':14A,17A '2.014':69C '2.022':119C '3.022':71C 'affect':64B 'allow':82C 'also':123C 'app':22B 'attack':47B,146C 'attribut':37B,97C 'autoescap':108C,140C 'browser':62B 'cgi':107C,139C 'control':110C 'copi':29B 'craft':51B,158C 'cross':84C 'cross-sit':83C 'cve':12A,15A 'default':115C 'effect':143C 'enabl':10A,137C 'encod':127C 'entiti':126C 'escap':111C 'field':9A,35B,42B,80C,90C 'filefield':44B,92C 'fill':94C 'form':8A,34B,79C 'framework':28B 'html':121C 'inject':54B,148C 'input':134C 'link':52B,159C 'method':128C 'name':105C 'one':130C 'packag':18B 'page':65B,152C 'paramet':4A,31B,76C,101C 'password':41B,89C 'perl':2A,19B,26B,73C 'reflect':5A,74C 'remot':145C 'replac':124C 'request':3A,30B,75C,100C 'return':132C 'run':57B 'script':55B,86C,149C 'site':85C 'tag':45B,93C,155C 'textfield':40B,88C 'tini':122C 'unchang':135C 'unescap':6A,32B,77C 'use':49B,153C 'valu':36B,81C,96C,114C 'version':67C 'victim':60B 'web':21B,27B 'web-app':20B 'webdyn':1A,23B,24B,66C,106C,120C,138C 'xss':11A","nicknames":[],"mitigations":[],"who_affected":"Applications built on WebDyne that render form tags from request parameters are exposed, since the reflected value reaches the page unescaped. Sites that do not use these tags with user-supplied input, or that run only static content, are less exposed. The sources do not say whether WEBDYNE_CGI_AUTOESCAPE offers any protection on versions 2.022 and later.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"first_public_at":"2026-10-31T15:16:54+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-78190","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78190","severity":null,"published_at":"2026-10-31T15:16:54+00:00","modified_at":"2026-10-31T15:16:54+00:00","first_seen_at":"2026-10-31T15:36:19+00:00","fetched_at":"2026-10-31T15:36:19+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"}