# 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 page

Status: published. Published: 2026-10-31. Updated: 2026-11-06.

WebDyne versions from 2.022 before 3.022 for Perl disclose application source to unauthenticated clients via the viewer in the default index page.

WebDyne's wrapper scripts, such as webdyne.psgi, enable the built-in index page by default. Its source viewer returns files under the document root named in the source parameter of an HTMX request, including .psp, .pm and .pl files.

A remote attacker can read the application's Perl code, including the __PERL__ blocks of .psp pages and any credentials they hold.

## Remediation

- fix: Upgrade to WebDyne 3.022 or later. (source: CNA: CPANSec)

## Affected products and versions

-  /  (WebDyne): ≥ 2.022; < 3.022 (affected, custom). Source: CNA: CPANSec

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-05; percentile 13.02%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-540, CWE-1188

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://metacpan.org/release/ASPEER/WebDyne-3.022/changes (CNA: CPANSec; release-notes)

- https://metacpan.org/release/ASPEER/WebDyne-3.022/changes (9b29abf9-4ab0-4765-b253-1875cd9b441e)

## Provenance

- CNA: CPANSec: https://www.cve.org/CVERecord?id=CVE-2026-78192; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78192; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-78192; retrieved 2026-11-06; source updated Not reported

Revision: 24fb17f75bb2bfc6222b8ac4a465a09ddc2d9c854e2cd5f10f323a59bc985531

Canonical: https://y2.dev/cve/CVE-2026-78192

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.