by Kastro
Paper/Archive/CVE-2026-39322

CVE-2026-39322

polarnl PolarLearn — PolarLearn: Any password authenticates banned accounts and grants API access

EPSS 0.2%CVSS 9.2
critical.is priorityof 100
31
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 15.1.151 × 203.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, POST /api/v1/auth/sign-in creates a valid session for banned accounts before verifying the supplied password. That session is then accepted across authenticated /api routes, enabling account data access and authenticated actions as the banned user.

Affected

ProductAffectedFixed inSource
PolarLearn<= v0-PRERELEASE-15–CNA

Scores by source

GitHub_M (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
CISA ADP8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/polarnl/PolarLearn/security/advisories/GHSA-9vx4-7ww7-4cf5