How to fix CVE-2026-25126?

Within 24 hours: Identify all PolarLearn instances in your environment and document their current versions. Within 7 days: Apply the available patch to all affected PolarLearn deployments and validate successful installation. Within 30 days: Conduct a security audit of forum voting records to identify any suspicious activity during the vulnerable period and implement input validation testing in your deployment pipeline.

Is Polarlearn affected by CVE-2026-25126?

PolarLearn installations prior to version 0-PRERELEASE-15 contain an API validation flaw that allows attackers to manipulate forum voting functionality through malicious requests.

CVE-2026-25126

HIGH

2026-01-29 [email protected]

7.1

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:00 vuln.today

Patch Released

Feb 20, 2026 - 20:46 nvd

Patch available

PoC Detected

Feb 20, 2026 - 20:46 vuln.today

Public exploit code

CVE Published

Jan 29, 2026 - 22:15 nvd

HIGH 7.1

Description

PolarLearn is a free and open-source learning program. Prior to version 0-PRERELEASE-15, the vote API route (`POST /api/v1/forum/vote`) trusts the JSON body’s `direction` value without runtime validation. TypeScript types are not enforced at runtime, so an attacker can send arbitrary strings (e.g., `"x"`) as `direction`. Downstream (`VoteServer`) treats any non-`"up"` and non-`null` value as a downvote and persists the invalid value in `votes_data`. This can be exploited to bypass intended business logic. Version 0-PRERELEASE-15 fixes the vulnerability.

Analysis

PolarLearn versions prior to 0-PRERELEASE-15 fail to validate the `direction` parameter in the forum vote API endpoint, allowing authenticated attackers to submit arbitrary values that bypass business logic and corrupt vote data. Public exploit code exists for this vulnerability. …

Remediation

Within 24 hours: Identify all PolarLearn instances in your environment and document their current versions. Within 7 days: Apply the available patch to all affected PolarLearn deployments and validate successful installation. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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Get intelligence summaries, risk assessment, exploit details, threat intel, and remediation guidance.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +36

POC: +20

CVE-2026-25126 vulnerability details – vuln.today

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CVE-2026-25126

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CVE-2026-25126

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External POC / Exploit Code