polarnl PolarLearn 0-PRERELEASE-15 Group Chat WebSocket improper authorization

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in polarnl PolarLearn. This affects an unknown function of the component Group Chat WebSocket. This manipulation causes improper authorization. This vulnerability is tracked as CVE-2026-25885. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in polarnl PolarLearn. It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component Group Chat WebSocket. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at wss://polarlearn.nl/api/v1/ws can be used without logging in. An unauthenticated client can subscribe to any group chat by providing a group UUID, and can also send messages to any group. The server accepts the message and stores it in the group’s chatContent, so this is not just a visual spam issue.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-25885 since 02/06/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 0-PRERELEASE-16 eliminates this vulnerability. Applying the patch 3ba588fda0d3f8e238483a20772719f27e52e79f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: PolarLearn 0-PRERELEASE-16
Patch: 3ba588fda0d3f8e238483a20772719f27e52e79f

Timelineinfo

02/06/2026 CVE reserved
02/10/2026 +4 days Advisory disclosed
02/10/2026 +0 days VulDB entry created
02/21/2026 +11 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-gvjm-5pw7-6c8c
Status: Confirmed

CVE: CVE-2026-25885 (🔒)
GCVE (CVE): GCVE-0-2026-25885
GCVE (VulDB): GCVE-100-345067

Entryinfo

Created: 02/10/2026 03:20
Updated: 02/21/2026 10:00
Changes: 02/10/2026 03:20 (70), 02/21/2026 10:00 (12)
Complete: 🔍
Cache ID: 216::103

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