CVE-2026-25126
PolarLearn's unvalidated vote direction allows vote count manipulation
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
PolarLearn's unvalidated vote direction allows vote count manipulation
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.
- Record
CVE-2026-25126- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N - Weakness
- CWE-20
- Updated
- 2026-11-02
EUVDEUVD-2026-4937
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.
- Record
EUVD-2026-4937- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N - Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-25126- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N - Weakness
- CWE-20
- Updated
- 2026-11-02
OSV
PolarLearn's unvalidated vote direction allows vote count manipulation
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.
- Record
CVE-2026-25126- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N - Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | Jvr2022/CVE-2026-25126 | 2026-01-31 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-25126 is a high vulnerability (CVSS 7.1) in Polarlearn, published January 29, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.38%, the 31st percentile. No source names a fixed version.