CVE-2026-1591Network attack vector

Stored XSS via unescaped upload-list username

Published Feb 3, 2026 · Updated Feb 3, 2026

Stored XSS in Foxit PDF Editor Cloud before 2026-02-03 allows remote authenticated users to execute JavaScript through a file upload. The upload file list inserts a malicious username into rendered HTML without proper escaping, causing its script payload to run when the list is displayed. Exploitation requires authenticated upload access and interaction by a user who displays the affected list, exposing data and actions available to that browser session.

CVSS severity6.3
Medium
EPSS probability0.20%
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 Foxit PDF Editor Cloud before 2026-02-03 allows remote authenticated users to execute JavaScript through a file upload. The upload file list inserts a malicious username into rendered HTML without proper escaping, causing its script payload to run when the list is displayed. Exploitation requires authenticated upload access and interaction by a user who displays the affected list, exposing data and actions available to that browser session.

The record

CVE
CVE-2026-1591
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Foxit Software
Product
Foxit PDF Editor Cloud
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 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=before 2026‑02‑03

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Foxit Software · Foxit PDF Editor Cloudversion=before 2026‑02‑03

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.3Foxit SoftwareCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/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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