Unknown severity · Source severity not reportedCVE-2026-78188

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

Answer in brief

CVE-2026-78188 records a Unknown severity vulnerability in WebDyne versions from 2.014 before 3.022 for Perl issue session cookies without the Secure, HttpOnly and SameSite attributes. The current sources do not mark it as known exploited. The current feed maps WebDyne (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 31, 2026Updated Oct 31, 2026Source checked Oct 31, 2026First seen by HOL Oct 31, 2026Material review Oct 31, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps WebDyne (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
WebDynegeneric	>=2.014 <3.022	3.022

Recommended response

Check inventory. Check lockfiles and deployed manifests for WebDyne.
Review the reported fix. Source-reported solution: Upgrade to WebDyne 3.022 or later. The SameSite attribute also requires CGI::Simple 1.22 or later.

Evidence timeline and material changes

Published upstream
Oct 31, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 31, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 31, 2026

Sources and claim methodology

Source referencemetacpan.org

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.