CVE-2026-25126 — HIGH (7.1)

Vulnerability 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.

CVSS Score

7.1

HIGH

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

Affected Products

Vendor	Product	Versions
Polarlearn	Polarlearn	-

Related Weaknesses (CWE)

CWE-20

References

https://github.com/polarnl/PolarLearn/commit/e6227d94d0e53e854f6a46480db8cd10511Patch
https://github.com/polarnl/PolarLearn/security/advisories/GHSA-ghpx-5w2p-p3qpExploitVendor Advisory

FAQ

What is CVE-2026-25126?

CVE-2026-25126 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 validat...

How severe is CVE-2026-25126?

CVE-2026-25126 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-25126?

Check the references section above for vendor advisories and patch information. Affected products include: Polarlearn Polarlearn.