CVE-2026-16809Network attack vectorHinoki check available

Stored script execution via unvalidated quota messages

Published Aug 26, 2026 · Updated Aug 26, 2026

Stored cross-site scripting in LimeSurvey 7.0.5 allows remote authenticated users to execute JavaScript through a survey quota message. The quota service HTML-decodes the submitted message and saves it without model validation before quota-page rendering places the stored value into browser content. Survey-management and quota-update permissions are required, and exploitation occurs when another user reaches the matching quota page.

CVSS severity7.2
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored cross-site scripting in LimeSurvey 7.0.5 allows remote authenticated users to execute JavaScript through a survey quota message. The quota service HTML-decodes the submitted message and saves it without model validation before quota-page rendering places the stored value into browser content. Survey-management and quota-update permissions are required, and exploitation occurs when another user reaches the matching quota page.

The record

CVE
CVE-2026-16809
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
LimeSurvey GmbH
Product
LimeSurvey
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=7.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LimeSurvey GmbH · LimeSurveyversion=7.0.5

Published CVSS scores

7.2Fluid AttacksCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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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