CVE-2024-55878Network attack vector

Script execution via unescaped workbook style attributes

Published Dec 12, 2024 · Updated Dec 13, 2024

Cross-site scripting in Shuchkin SimpleXLSX 1.0.12 through 1.1.11 allows remote authenticated users to run JavaScript via crafted XLSX styles. SimpleXLSXEx reads workbook font, fill, border, and color attributes into HTML styling without escaping or restricting them before toHTMLEx renders the table. Exploitation requires an application to process attacker-controlled workbook content with toHTMLEx and a user to view the generated HTML, exposing browser-accessible data.

CVSS severity6.8
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in Shuchkin SimpleXLSX 1.0.12 through 1.1.11 allows remote authenticated users to run JavaScript via crafted XLSX styles. SimpleXLSXEx reads workbook font, fill, border, and color attributes into HTML styling without escaping or restricting them before toHTMLEx renders the table. Exploitation requires an application to process attacker-controlled workbook content with toHTMLEx and a user to view the generated HTML, exposing browser-accessible data.

The record

CVE
CVE-2024-55878
Published
Dec 12, 2024
Updated
Dec 13, 2024
Vendor
Shuchkin
Product
SimpleXLSX
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 13, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.0.12, < 1.1.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shuchkin · SimpleXLSXversion=>= 1.0.12, < 1.1.12

Published CVSS scores

6.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo