Cross-site Scripting vulnerability in SimpleXLSXEx::readXfs and SimpeXLSX::toHTMLEx
Priority LOW 30CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00459 39th percentileScored 2026-11-07
Fix Fixed simplexlsx (shuchkin): 1.1.12shuchkin/simplexlsx (Packagist): 1.1.12
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| shuchkin | simplexlsx | 1.0.12 to before 1.1.12 | 1.1.12 | Patch available | CNA |
| — | shuchkin/simplexlsx (Packagist) | 1.0.12 to before 1.1.12 | 1.1.12 | Patch available | GHSA-x6mh-rjwm-8ph7 |
- simplexlsx Vendorshuchkin Affected 1.0.12 to before 1.1.12 Fixed in 1.1.12 Patch available CNA
- shuchkin/simplexlsx (Packagist) Vendor— Affected 1.0.12 to before 1.1.12 Fixed in 1.1.12 Patch available GHSA-x6mh-rjwm-8ph7
Remediation
- Fix · CNA simplexlsx (shuchkin) Fixed in 1.1.12
- Fix · GHSA-x6mh-rjwm-8ph7 shuchkin/simplexlsx (Packagist) Fixed in 1.1.12 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-55878
- 2026-10-03 Alias added: GHSA-x6mh-rjwm-8ph7
References
More shuchkin vulnerabilities
- TI-2024-37323 Cross-site scripting in shuchkin simplexlsx CVSS 3.1MEDIUM 5.4
Sources
- CVE-2024-55878 · CVE Program
- CVE-2024-55878 · NVD
- FIRST EPSS
- GHSA-x6mh-rjwm-8ph7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences