CVE-2026-25126— PolarLearn's unvalidated vote direction allows vote count manipulation
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I. Basic Information for CVE-2026-25126
Vulnerability Information
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Vulnerability Title
PolarLearn's unvalidated vote direction allows vote count manipulation
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
PolarLearn 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PolarLearn是PolarNL开源的一个在线学习平台。 PolarLearn 0-PRERELEASE-15之前版本存在输入验证错误漏洞，该漏洞源于缺少运行时验证，可能导致绕过预期的业务逻辑。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| polarnl | PolarLearn | < 0-PRERELEASE-15 | - |
II. Public POCs for CVE-2026-25126
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | CVE-2026-25126 Proof-of-Concept demonstrating vote count manipulation in PolarLearn due to improper runtime validation of the forum vote direction parameter. Published after upstream patch release. | https://github.com/Jvr2022/CVE-2026-25126 | POC Details |
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IV. Related Vulnerabilities
Same product: PolarLearn
- CVE-2026-39322
PolarLearn: Any password authenticates banned accounts and g - CVE-2026-35610
PolarLearn has a Server Action Admin Bypass in Account Manag - CVE-2026-25885
PolarLearn allows Unauthenticated WebSocket access allows su - CVE-2026-25222
PolarLearn Affected by User Enumeration via Argon2 Timing At - CVE-2026-25221
PolarLearn has Multiple Login CSRFs via Missing OAuth state
Same vendor: polarnl
- CVE-2026-39322
PolarLearn: Any password authenticates banned accounts and g - CVE-2026-35610
PolarLearn has a Server Action Admin Bypass in Account Manag - CVE-2026-25885
PolarLearn allows Unauthenticated WebSocket access allows su - CVE-2026-25222
PolarLearn Affected by User Enumeration via Argon2 Timing At - CVE-2026-25221
PolarLearn has Multiple Login CSRFs via Missing OAuth state
Same weakness: CWE-20
V. Comments for CVE-2026-25126
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