EUVD-2026-19853
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3Description
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.
Analysis
Authentication bypass in PolarLearn ≤0-PRERELEASE-15 allows unauthenticated remote attackers to gain authenticated session access as banned users without password verification. The flaw enables complete account takeover and unauthorized data access through a session generation vulnerability in the /api/v1/auth/sign-in endpoint. …
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Remediation
Within 24 hours: Identify all PolarLearn deployments and their current versions; isolate systems running version 0-PRERELEASE-15 or earlier from untrusted networks if possible. Within 7 days: Contact PolarLearn vendor for patch availability and interim guidance; implement network-level access controls restricting /api/v1/auth/sign-in endpoint to trusted sources only. …
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External POC / Exploit Code
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