PolarLearn’s unvalidated vote direction allows vote count manipulation_CVE-2026-25126

7.1 / 10

HIGH

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

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.

Basic Information

ID CVE-2026-25126

Source GitHub_M

Published Jan 29, 2026 at 22:06

Affected Product

Vendor polarnl

Product PolarLearn

Version < 0-PRERELEASE-15

Affected Versions polarnl PolarLearn < 0-PRERELEASE-15

CWE Classification

CWE-20

References

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    "published": "2026-01-29T22:06:37.224Z",
    "modified": "2026-01-29T22:06:37.224Z",
    "type": "cve",
    "title": "PolarLearn's unvalidated vote direction allows vote count manipulation",
    "source": "GitHub_M",
    "references": "https://github.com/polarnl/PolarLearn/security/advisories/GHSA-ghpx-5w2p-p3qp\nhttps://github.com/polarnl/PolarLearn/commit/e6227d94d0e53e854f6a46480db8cd1051184d41",
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