Is this vulnerability remotely exploitable?

Yes. Any party that can reach the `POST /api/v1/forum/vote` endpoint and send crafted HTTP requests can attempt to exploit the lack of runtime validation.

Does exploitation require authentication or special privileges?

It depends on how the forum is configured. If voting is available to authenticated users only, an attacker would need an account, but no special privileges beyond the ability to vote. In more permissive setups, even unauthenticated users with network access may be able to exploit the issue.

What is the safest general fix pattern for this issue?

Implement strict runtime validation for the `direction` field at the API boundary, allowing only known, valid values (such as a small enum) and rejecting all others with an appropriate error response. Ensure that business logic components like `VoteServer` never receive unvalidated input.

Severity:

HIGH RISK

(7.1)

Improper Input Validation (CWE-20) in PolarLearn Forum Vote API

CVE-2026-25126

Published:

Jan 29, 2026

Status:

Awaiting Analysis

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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Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Business Logic Bypass / Integrity Impact

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Business Logic Bypass / Integrity Impact

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

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Improper Input Validation (CWE-20) in PolarLearn Forum Vote API

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

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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