CVE-2023-5200Network attack vector

Stored XSS via unescaped flipbook shortcode attributes

Published Oct 20, 2023 · Updated Apr 8, 2026

Stored XSS in the flipbook shortcode in Devaldi Limited FlowPaper 2.0.3 and earlier allows remote authenticated users to run scripts. The shortcode handler inserts user-supplied attributes into generated iframe markup without sufficient sanitization and output escaping. Contributor-level access is sufficient to store the payload in a page, and the script executes in a visitor's browser when that page is opened.

CVSS severity6.4
Medium
EPSS probability0.45%
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 the flipbook shortcode in Devaldi Limited FlowPaper 2.0.3 and earlier allows remote authenticated users to run scripts. The shortcode handler inserts user-supplied attributes into generated iframe markup without sufficient sanitization and output escaping. Contributor-level access is sufficient to store the payload in a page, and the script executes in a visitor's browser when that page is opened.

The record

CVE
CVE-2023-5200
Published
Oct 20, 2023
Updated
Apr 8, 2026
Vendor
Devaldi Limited
Product
FlowPaper
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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=0 <=2.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Devaldi Limited · FlowPaperversion=0 <=2.0.3

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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')
T1059.007JavaScript/JScript

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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