{"id":"CVE-2026-25126","aliases":["EUVD-2026-4937","GHSA-ghpx-5w2p-p3qp"],"status":"published","title":"PolarLearn's unvalidated vote direction allows vote count manipulation","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.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00376,"percentile":0.31981,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-20"],"published":"2026-01-29T22:06:37Z","modified":"2026-11-02T10:30:36Z","exploits":[{"source":"pocgithub","id":"Jvr2022/CVE-2026-25126","title":"Jvr2022/CVE-2026-25126","date":"2026-01-31","url":"https://github.com/Jvr2022/CVE-2026-25126"}],"products":[{"vendor":"polarlearn","product":"polarlearn"},{"vendor":"polarnl","product":"polarlearn"}],"references":[{"url":"https://github.com/polarnl/PolarLearn/security/advisories/GHSA-ghpx-5w2p-p3qp","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory"]},{"url":"https://github.com/polarnl/PolarLearn/commit/e6227d94d0e53e854f6a46480db8cd1051184d41","tags":["x_refsource_MISC","Patch","fix"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25126.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25126","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-25126","title":"PolarLearn's unvalidated vote direction allows vote count manipulation","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.","status":"published","published":"2026-01-29T22:06:37.224Z","modified":"2026-02-02T16:34:07.949Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T13:41:30.911526Z"}],"euvd":[{"id":"EUVD-2026-4937","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.","status":"published","published":"2026-01-29T22:06:37Z","modified":"2026-02-02T16:34:07Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T19:48:45.464917Z"}],"nvd":[{"id":"CVE-2026-25126","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.","status":"published","published":"2026-01-29T22:15:56.423Z","modified":"2026-06-17T10:24:09.197Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:12:04.769088Z"}],"osv":[{"id":"CVE-2026-25126","title":"PolarLearn's unvalidated vote direction allows vote count manipulation","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.","status":"published","published":"2026-01-29T22:06:37.224Z","modified":"2026-11-02T10:30:36.704569548Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:44:59.438965Z"}]}}