CVE-2021-34354Network attack vector

Browser script execution via undisclosed stored input

Published Oct 1, 2021 · Updated Sep 17, 2024

Stored XSS in QNAP Photo Station before 6.0.18 allows remote authenticated users to execute script in another user's browser. QNAP has not disclosed the affected endpoint, input field, or missing output-encoding operation that permits the stored payload. Exploitation requires low-privileged access and user interaction, and it can expose or alter data available to the victim's web session.

CVSS severity5.4
Medium
EPSS probability0.65%
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 QNAP Photo Station before 6.0.18 allows remote authenticated users to execute script in another user's browser. QNAP has not disclosed the affected endpoint, input field, or missing output-encoding operation that permits the stored payload. Exploitation requires low-privileged access and user interaction, and it can expose or alter data available to the victim's web session.

The record

CVE
CVE-2021-34354
Published
Oct 1, 2021
Updated
Sep 17, 2024
Vendor
Linn Products Limited
Product
Photo Station
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=unspecified <6.0.18 ( 2021/09/01 )

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · Photo Stationversion=unspecified <6.0.18 ( 2021/09/01 )

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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