CVE-2026-25126 – PolarLearn’s unvalidated vote direction allows vote count manipulation

CVE ID : CVE-2026-25126

Published : Jan. 29, 2026, 10:15 p.m. | 54 minutes ago

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.

Severity: 7.1 | HIGH

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