CVE-2024-55878

Cross-site Scripting vulnerability in SimpleXLSXEx::readXfs and SimpeXLSX::toHTMLEx

MEDIUM
6.8
CVSS Score
Published: December 12, 2024 at 07:20 PM UTC
Updated: June 17, 2026 at 08:11 AM UTC
1 product affected across 1 vendorSimpleXLSX

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Severity
MEDIUM6.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

SimpleXLSX is software for parsing and retrieving data from Excel XLSx files. Starting in version 1.0.12 and prior to version 1.1.12, when calling the extended toHTMLEx method, it is possible to execute arbitrary JavaScript code. Version 1.1.12 fixes the issue. As a workaround, don't use direct publication via toHTMLEx.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.1.12
Affected range stops below 1.1.12, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.8MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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