Vulnerability in PolarLearn (CVE-2026-25126)
Summary
Vulnerability in PolarLearn (CVE-2026-25126). Data can be tampered with by attackers. Exploitable via POST /api/v1/forum/vote.
Original description
The description as published by the source.
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: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-25126 has been found in PolarLearn.
Attackers can target a specific entry point like POST /api/v1/forum/vote over the network to misuse the product.
Data can be tampered with by attackers.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "PolarLearn CVE-2026-25126" on the vendor's site.
CVE-2026-25126 (PolarLearn) — CWE-20
Attack vector: remote (network-reachable) / no user interaction
Attack surface: POST /api/v1/forum/vote / direction / VoteServer / null
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-20) exists in PolarLearn. Attackers reach the vulnerable code path via POST /api/v1/forum/vote.
Check the vendor advisory for the affected versions of PolarLearn. Attack surface: POST /api/v1/forum/vote / direction / VoteServer / null.
Severity: ?. Data can be tampered with by attackers.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual POST /api/v1/forum/vote requests with malformed payloads or SQL meta-characters. Run grep -r 'PolarLearn' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'PolarLearn' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
PolarLearnを grep し、稼働しているサービス・バージョンを把握する。 -
2Hunt for indicators of compromise detect
grep 'POST /api/v1/forum/vote' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
POST /api/v1/forum/voteへの異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Post-deployment verification verify
Replay attack against POST /api/v1/forum/vote on staging to confirm patch closes the vectorパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 2 と同じログクエリでアラート再発が無いか継続監視。
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com