CVE-2026-25126: Polarlearn

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Polarlearn Polarlearn: affected versions not specified

Published 2026-01-29. Last modified 2026-06-17.