Is this vulnerability remotely exploitable over the internet?

Yes, if the host running act exposes the cache server to the internet (for example, via a public IP with open ports or port forwarding), remote attackers can connect and interact with the cache service. If it is strictly bound to localhost and protected by host firewalls, the risk is limited to local or privileged users.

What level of access does an attacker need to exploit this?

The attacker only needs network-level access to the cache server's port. No credentials, tokens, or prior authentication are required. In many default or misconfigured setups, this may include any user on the same network segment, VPN, or—if the port is exposed—anyone on the internet.

What is the safest general fix pattern for this type of issue?

The most robust pattern is to ensure internal services: - are bound to loopback or tightly controlled interfaces, - enforce explicit authorization checks on every state-changing or data-accessing operation, and - avoid assuming that "development" or "local" tools are inherently isolated. Applying these patterns ensures that only trusted, authenticated clients can read or modify cache entries.

Severity:

HIGH RISK

(8.2)

Missing Authorization on Cache Service (CWE-862) in act GitHub Actions Runner

CVE-2026-34042

Published:

Mar 30, 2026

Status:

Deferred

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Vulnerability Type

Category:

Missing Authorization

CWE:

CWE-862

Impact:

Remote Code Execution via Cache Poisoning

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Missing Authorization

CWE:

CWE-862

Impact:

Remote Code Execution via Cache Poisoning

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

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Missing Authorization on Cache Service (CWE-862) in act GitHub Actions Runner

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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