# CVE-2026-78188: WebDyne versions from 2.014 before 3.022 for Perl issue session cookies without the Secure, HttpOnly and SameSite attributes

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

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.

## Remediation

- fix: Upgrade to WebDyne 3.022 or later. The SameSite attribute also requires CGI::Simple 1.22 or later. (source: CNA: CPANSec)

## Affected products and versions

-  /  (WebDyne): ≥ 2.014; < 3.022 (affected, custom). Source: CNA: CPANSec

## Severity and prioritization

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-05; percentile 2.35%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-614, CWE-1004, CWE-1275

## 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-2026-78188; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78188; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-78188; retrieved 2026-11-06; source updated Not reported

Revision: 5805e808b27faf1bef8742ca0fa36176b224e2350730c1326cf976a99293e0d1

Canonical: https://y2.dev/cve/CVE-2026-78188

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