CVE-2025-40722Network attack vector

Stored script execution via unvalidated tag replacement

Published Jul 3, 2025 · Updated Jul 3, 2025

Stored XSS in Flatboard Pro before 3.2.2 allows remote authenticated users to run script in another user's browser through tag changes. The /config.php/tags route stores the replace parameter without proper input validation, so crafted markup is later rendered as active content. Low-privileged access and a subsequent user's passive viewing are required; execution is confined to that user's browser context.

CVSS severity5.1
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Flatboard Pro before 3.2.2 allows remote authenticated users to run script in another user's browser through tag changes. The /config.php/tags route stores the replace parameter without proper input validation, so crafted markup is later rendered as active content. Low-privileged access and a subsequent user's passive viewing are required; execution is confined to that user's browser context.

The record

CVE
CVE-2025-40722
Published
Jul 3, 2025
Updated
Jul 3, 2025
Vendor
Flatboard
Product
Flatboard
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 3, 2025Record 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 <3.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Flatboard · Flatboardversion=0 <3.2.2

Published CVSS scores

5.1INCIBECVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/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')
T1189Drive-by Compromise

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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