CVE-2026-78188: vulnerability in WebDyne
WebDyne versions from 2.014 before 3.022 for Perl issue session cookies without the Secure, HttpOnly and SameSite attributes
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.1%
WebDyne versions from 2.014 before 3.022 for Perl issue session cookies without the Secure, HttpOnly and SameSite attributes.
WebDyne::Session sets its session cookie with only a name, value and path.
Browsers then send the session ID over plain HTTP and with cross-site requests, and expose it to page scripts. A network attacker or an injected script can steal the session, and another site can make requests that carry it.
Affected products
WebDyneRelated CVEs — WebDyne
In the same product, most dangerous first.
CVE-2026-78191—WebDyne versions from 2.031 before 3.022 for Perl execute files with .psp anywhere in the name as Perl pagesEPSS 0.5%CVE-2026-78189—WebDyne versions from 3.007 before 3.022 for Perl execute .psp files outside the document root via path traversal in the PSGI API route fallbackEPSS 0.2%CVE-2026-78190—WebDyne versions from 2.014 before 3.022 for Perl reflect request parameters unescaped into form field values, allowing cross-site scriptingEPSS 0.2%CVE-2026-78192—WebDyne versions from 2.022 before 3.022 for Perl disclose application source to unauthenticated clients via the viewer in the default index pageEPSS 0.2%