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CVE-2026-25126

HighPublished

PolarLearn's unvalidated vote direction allows vote count manipulation

Published: Jan 29, 2026
Updated: Feb 2, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

7.1/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 29.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-25126PoC
Proof-of-concept for CVE-2026-25126 demonstrating vote count manipulation in PolarLearn via improper runtime validation of the forum vote direction parameter, with fix details.

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