CVE-2026-78191: vulnerability in WebDyne
WebDyne versions from 2.031 before 3.022 for Perl execute files with .psp anywhere in the name as Perl pages
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 0.5%
WebDyne versions from 2.031 before 3.022 for Perl execute files with .psp anywhere in the name as Perl pages.
WebDyne decides whether to run a requested file as a page by matching its name against WEBDYNE_PSP_EXT_RE, which has no end anchor.
An application that accepts uploads by checking only the final extension lets a remote attacker upload a file such as report.psp.pdf and run its embedded Perl by requesting it.
Affected products
WebDyneRelated CVEs — WebDyne
In the same product, most dangerous first.
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%CVE-2026-78188—WebDyne versions from 2.014 before 3.022 for Perl issue session cookies without the Secure, HttpOnly and SameSite attributesEPSS 0.1%