A Regular Expression Denial of Service (ReDoS) issue was discovered in Puppet Server 7.9.2 certificate validation. An issue related to specifically crafted certificate names significantly slowed down server operations.

Puppet resourceapi (shipped in Puppet Core 8.x and Puppet Enterprise 2023.8.x and 2025.x) does not preserve the sensitive flag on parameters defined via the resource-api, causing values such as passwords to be stored in cleartext in the agent's local transaction state cache. Affected versions of the resourceapi module include all versions between 1.5.0 - 1.9.1 and 2.0.0 The issue was fixed in puppet resourceapi 1.9.2 and 2.0.1 released with Puppet Core 8.20.0 and PE 2023.8.10 & PE 2025.11.0.

A flaw was found where the metrics API endpoints of Puppet Server and PuppetDB leaked sensitive information to the local network. Listening to these network endpoints could allow attackers the ability to exploit additional computer systems. The highest impact of this flaw is confidentiality.

A cross-site scripting vulnerability in Puppet Enterprise Console of Puppet Enterprise allows a user to inject scripts into the Puppet Enterprise Console when using the Orchestrator. Affected releases are Puppet Puppet Enterprise: 2017.3.x versions prior to 2017.3.6.

The previous version of Puppet Enterprise 2018.1 is vulnerable to unsafe code execution when upgrading pe-razor-server. Affected releases are Puppet Enterprise: 2018.1.x versions prior to 2018.1.1 and razor-server and pe-razor-server prior to 1.9.0.0.

Puppet Enterprise 2016.4.x prior to 2016.4.12, Puppet Enterprise 2017.3.x prior to 2017.3.7, Puppet Enterprise 2018.1.x prior to 2018.1.1, Puppet Agent 1.10.x prior to 1.10.13, Puppet Agent 5.3.x prior to 5.3.7, and Puppet Agent 5.5.x prior to 5.5.2, were vulnerable to an attack where an unprivileged user on Windows agents could write custom facts that can escalate privileges on the next puppet run. This was possible through the loading of shared libraries from untrusted paths.

A cross-site scripting vulnerability in Puppet Enterprise Console of Puppet Enterprise allows a user to inject scripts into the Puppet Enterprise Console when using the Puppet Enterprise Console. Affected releases are Puppet Puppet Enterprise: 2017.3.x versions prior to 2017.3.6.

Puppet Enterprise 2017.3.x prior to 2017.3.3 are vulnerable to a remote execution bug when a specially crafted string was passed into the factertask or puppetconf tasks. This vulnerability only affects tasks in the affected modules, if you are not using puppet tasks you are not affected by this vulnerability.

MCollective 2.7.0 and 2.8.x before 2.8.9, as used in Puppet Enterprise, allows remote attackers to execute arbitrary code via vectors related to the mco ping command.

The Puppet Communications Protocol in Puppet Enterprise 2015.3.x before 2015.3.3 does not properly validate certificates for the broker node, which allows remote non-whitelisted hosts to prevent runs from triggering via unspecified vectors.

The Puppet Communications Protocol (PCP) Broker incorrectly validates message header sizes. An attacker could use this to crash the PCP Broker, preventing commands from being sent to agents. This is resolved in Puppet Enterprise 2016.4.3 and 2016.5.2.

Open redirect vulnerability in the Console in Puppet Enterprise 2015.x and 2016.x before 2016.4.0 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a // (slash slash) followed by a domain in the redirect parameter. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-6501.

Puppet Enterprise before 3.2.0 does not properly restrict access to node endpoints in the console, which allows remote attackers to obtain sensitive information via unspecified vectors.

The master external node classification script in Puppet Enterprise before 3.2.0 does not verify the identity of consoles, which allows remote attackers to create arbitrary classifications on the master by spoofing a console.

The pemcollective module in Puppet Enterprise (PE) before 2.7.1 does not properly restrict access to a catalog of private SSL keys, which allows remote authenticated users to obtain sensitive information and gain privileges by leveraging root access to a node, related to the master role.

Puppet Enterprise (PE) before 2.6.1 does not properly invalidate sessions when the session secret has changed, which allows remote authenticated users to retain access via unspecified vectors.

Multiple cross-site request forgery (CSRF) vulnerabilities in the (1) node request management, (2) live management, and (3) user administration components in the console in Puppet Enterprise (PE) before 2.7.1 allow remote attackers to hijack the authentication of unspecified victims via unknown vectors.

Multiple cross-site scripting (XSS) vulnerabilities in Puppet Dashboard 1.0 before 1.2.5 and Enterprise 1.0 before 1.2.5 and 2.x before 2.0.1 allow remote attackers to inject arbitrary web script or HTML via unspecified fields.

Multiple cross-site request forgery (CSRF) vulnerabilities in Puppet Enterprise (PE) before 3.0.1 allow remote attackers to hijack the authentication of users for requests that deleting a (1) report, (2) group, or (3) class or possibly have other unspecified impact.

Puppet Enterprise 2.8.x before 2.8.7 allows remote attackers to obtain sensitive information via vectors involving hiding and unhiding nodes.

In previous versions of Puppet Agent it was possible to install a module with world writable permissions. Puppet Agent 5.3.4 and 1.10.10 included a fix to this vulnerability.

In Puppet Enterprise 2017.1.x and 2017.2.1, using specially formatted strings with certain formatting characters as Classifier node group names or RBAC role display names causes errors, effectively causing a DOS to the service. This was resolved in Puppet Enterprise 2017.2.2.

The reset password page in Puppet Enterprise before 3.0.1 does not force entry of the current password, which allows attackers to modify user passwords by leveraging session hijacking, an unattended workstation, or other vectors.

Puppet Enterprise before 3.0.1 does not sufficiently invalidate a session when a user logs out, which might allow remote attackers to hijack sessions by obtaining an old session ID.

Puppet Enterprise before 3.0.1 uses HTTP responses that contain sensitive information without the "no-cache" setting, which might allow local users to obtain sensitive information such as (1) host name, (2) MAC address, and (3) SSH keys via the web browser cache.

In previous versions of Puppet Agent it was possible for the agent to retrieve facts from an environment that it was not classified to retrieve from. This was resolved in Puppet Agent 5.3.4, included in Puppet Enterprise 2017.3.4

Puppet Enterprise before 3.0.1 does not use a session timeout, which makes it easier for attackers to gain privileges by leveraging an unattended workstation.

From puppet labs: Puppet agents with certnames of IP addresses can be impersonated

This affects Puppet 2.6.16 and 2.7.17

If an authenticated host with a certname of an IP address changes IP addresses, and a second host assumes the first host's former IP address, the second host will be treated by the puppet master as the first one, giving the second host access to the first host's catalog. Note: This will not be fixed in Puppet versions prior to the forthcoming 3.x. Instead, with this announcement IP-based authentication in Puppet < 3.x is deprecated.

Resolved in Puppet 2.6.17, 2.7.18

Puppet 2.6.x before 2.6.14 and 2.7.x before 2.7.11, and Puppet Enterprise (PE) Users 1.0, 1.1, 1.2.x, 2.0.x before 2.0.3, when managing a user login file with the k5login resource type, allows local users to gain privileges via a symlink attack on .k5login.

The changeuser method in the SUIDManager (lib/puppet/util/suidmanager.rb) in Puppet 2.6.x before 2.6.14 and 2.7.x before 2.7.11, and Puppet Enterprise (PE) Users 1.0, 1.1, 1.2.x, 2.0.x before 2.0.3 does not properly manage group privileges, which allows local users to gain privileges via vectors related to (1) the changeuser not dropping supplementary groups in certain conditions, (2) changes to the eguid without associated changes to the egid, or (3) the addition of the real gid to supplementary groups.