Is this vulnerability remotely exploitable?

Yes. An unauthenticated attacker over the network can exploit this by sending repeated login requests and measuring response times, without needing any prior access.

What level of access does an attacker need to take advantage of this issue?

Only network access to the public sign-in endpoint is required. The attacker does not need valid credentials or an existing account.

What is the safest general fix pattern for this vulnerability class?

The most robust pattern is to normalize authentication behavior so that both existing and non-existing users follow indistinguishable execution paths and costs. For example, always perform a fixed-cost Argon2 hash and return a generic failure message, regardless of whether the account exists.

Severity:

HIGH RISK

(7.5)

Timing Side-Channel User Enumeration (CWE-200) in PolarLearn Sign-In Flow

CVE-2026-25222

Published:

Feb 2, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Information Exposure Through Side-Channel

CWE:

CWE-200

Impact:

User Enumeration and Information Exposure

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Information Exposure Through Side-Channel

CWE:

CWE-200

Impact:

User Enumeration and Information Exposure

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

START 14 DAYS FREE TRIAL

BOOK A DEMO

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Timing Side-Channel User Enumeration (CWE-200) in PolarLearn Sign-In Flow

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare