CVE-2026-14820Public exploitNetwork attack vector

Username enumeration and password guessing via quiz login

Published Jul 27, 2026 · Updated Jul 27, 2026

Information exposure in Quiz and Survey Master before 11.1.3 allows remote attackers to enumerate usernames through its quiz login. The qsm_ajax_login action returns distinct errors for nonexistent and valid usernames, accepts repeated guesses without rate limiting, and omits the standard failed-login event. This unauthenticated action requires no nonce, enabling password guessing without creating a session or triggering brute-force protection plugins.

CVSS severity5.3
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Quiz and Survey Master before 11.1.3 allows remote attackers to enumerate usernames through its quiz login. The qsm_ajax_login action returns distinct errors for nonexistent and valid usernames, accepts repeated guesses without rate limiting, and omits the standard failed-login event. This unauthenticated action requires no nonce, enabling password guessing without creating a session or triggering brute-force protection plugins.

The record

CVE
CVE-2026-14820
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
ExpressTech Systems
Product
Quiz and Survey Master
Classifications
CWE-200, T1087, T1110.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <11.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ExpressTech Systems · Quiz and Survey Masterversion=0 <11.1.3

Published CVSS scores

5.3WPScanCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1087Account Discovery
T1110.001Password Guessing

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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