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Message-ID: <dee5281a-f19e-4a76-b65c-8fdb36e0b668@cpansec.org>
Date: Sat, 31 Oct 2026 14:38:48 +0000
From: Robert Rothenberg <rrwo@...nsec.org>
To: oss-security@...ts.openwall.com
Subject: WebDyne for Perl (5 CVEs)
CVE-2026-78188
WebDyne versions from 2.014 before 3.022 for Perl issue session
cookies without the Secure, HttpOnly and SameSite attributes
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
fallback
CVE-2026-78190
WebDyne versions from 2.014 before 3.022 for Perl reflect request
parameters unescaped into form field values, allowing cross-site
scripting
CVE-2026-78191
WebDyne versions from 2.031 before 3.022 for Perl execute files with
.psp anywhere in the name as Perl pages
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
========================================================================
CVE-2026-78188 CPAN Security Group
========================================================================
CVE ID: CVE-2026-78188
Distribution: WebDyne
Versions: from 2.014 before 3.022
MetaCPAN: https://metacpan.org/dist/WebDyne
VCS Repo: https://github.com/aspeer/WebDyne
WebDyne versions from 2.014 before 3.022 for Perl issue session cookies
without the Secure, HttpOnly and SameSite attributes
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.
Problem types
-------------
- CWE-614 Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
- CWE-1004 Sensitive Cookie Without 'HttpOnly' Flag
- CWE-1275 Sensitive Cookie with Improper SameSite Attribute
Solutions
---------
Upgrade to WebDyne 3.022 or later. The SameSite attribute also requires
CGI::Simple 1.22 or later.
References
----------
https://metacpan.org/release/ASPEER/WebDyne-3.022/changes
========================================================================
CVE-2026-78189 CPAN Security Group
========================================================================
CVE ID: CVE-2026-78189
Distribution: WebDyne
Versions: from 3.007 before 3.022
MetaCPAN: https://metacpan.org/dist/WebDyne
VCS Repo: https://github.com/aspeer/WebDyne
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
fallback
Description
-----------
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
fallback.
When a request matches no file, the PSGI handler retries it as an API
route through api_filename. That keeps .. segments in the request path
and only checks that the joined path starts with the document root,
which a request for /../private passes.
A remote attacker can run the embedded Perl in any .psp file the server
can read, such as one uploaded to a directory outside the document
root.
Problem types
-------------
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
('Path Traversal')
Solutions
---------
Upgrade to WebDyne 3.022 or later.
References
----------
https://metacpan.org/release/ASPEER/WebDyne-3.022/changes
========================================================================
CVE-2026-78190 CPAN Security Group
========================================================================
CVE ID: CVE-2026-78190
Distribution: WebDyne
Versions: from 2.014 before 3.022
MetaCPAN: https://metacpan.org/dist/WebDyne
VCS Repo: https://github.com/aspeer/WebDyne
WebDyne versions from 2.014 before 3.022 for Perl reflect request
parameters unescaped into form field values, allowing cross-site
scripting
Description
-----------
WebDyne versions from 2.014 before 3.022 for Perl reflect request
parameters unescaped into form field values, allowing cross-site
scripting.
The textfield, password_field and filefield tags fill their value
attribute from the request parameter of the same name.
WEBDYNE_CGI_AUTOESCAPE, which controls escaping of these values,
defaults to off. From 2.022, WebDyne::HTML::Tiny also replaced its
entity_encode method with one that returns its input unchanged, so
enabling WEBDYNE_CGI_AUTOESCAPE has no effect.
A remote attacker can inject script into any page using these tags
through a crafted link.
Problem types
-------------
- CWE-79 Improper Neutralization of Input During Web Page Generation
('Cross-site Scripting')
Solutions
---------
Upgrade to WebDyne 3.022 or later.
References
----------
https://metacpan.org/release/ASPEER/WebDyne-3.022/changes
========================================================================
CVE-2026-78191 CPAN Security Group
========================================================================
CVE ID: CVE-2026-78191
Distribution: WebDyne
Versions: from 2.031 before 3.022
MetaCPAN: https://metacpan.org/dist/WebDyne
VCS Repo: https://github.com/aspeer/WebDyne
WebDyne versions from 2.031 before 3.022 for Perl execute files with
.psp anywhere in the name as Perl pages
Description
-----------
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.
Problem types
-------------
- CWE-777 Regular Expression without Anchors
Solutions
---------
Upgrade to WebDyne 3.022 or later.
References
----------
https://metacpan.org/release/ASPEER/WebDyne-3.022/changes
========================================================================
CVE-2026-78192 CPAN Security Group
========================================================================
CVE ID: CVE-2026-78192
Distribution: WebDyne
Versions: from 2.022 before 3.022
MetaCPAN: https://metacpan.org/dist/WebDyne
VCS Repo: https://github.com/aspeer/WebDyne
WebDyne versions from 2.022 before 3.022 for Perl disclose application
source to unauthenticated clients via the viewer in the default index
page
Description
-----------
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.
Problem types
-------------
- CWE-540 Inclusion of Sensitive Information in Source Code
- CWE-1188 Initialization of a Resource with an Insecure Default
Solutions
---------
Upgrade to WebDyne 3.022 or later.
References
----------
https://metacpan.org/release/ASPEER/WebDyne-3.022/changes
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