CVE-2026-25126
PolarLearn's unvalidated vote direction allows vote count manipulation
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 7.1EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
29 Jan 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Affected products
polarnl · PolarLearnWant to know if your infrastructure is exposed to this?
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