CVE-2022-40879Public exploitNetwork attack vector

Reflected XSS via unfiltered preview error message

Published Sep 29, 2022 · Updated May 20, 2025

Reflected XSS in kkFileView 4.1.0 allows remote attackers to execute script in a victim's browser through a crafted preview URL. OnlinePreviewController passes the user-controlled errorMsg value to the front-end error prompt without filtering or output encoding. Exploitation requires a victim to open a Base64- and URL-encoded preview link, after which the injected script runs in the site's browser context.

CVSS severity6.1
Medium
EPSS probability1.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in kkFileView 4.1.0 allows remote attackers to execute script in a victim's browser through a crafted preview URL. OnlinePreviewController passes the user-controlled errorMsg value to the front-end error prompt without filtering or output encoding. Exploitation requires a victim to open a Base64- and URL-encoded preview link, after which the injected script runs in the site's browser context.

The record

CVE
CVE-2022-40879
Published
Sep 29, 2022
Updated
May 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 29, 2022CVE publishedPublication date reported by the CVE source.
  2. May 20, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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