How severe is CVE-2024-55878?

CVE-2024-55878 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2024-55878 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2024-55878?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-55878 have an EU (EUVD) identifier?

Yes. CVE-2024-55878 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-3522.

When was CVE-2024-55878 published?

CVE-2024-55878 was published on 2024-12-12 and last updated on 2026-06-17.

CVE-2024-55878

CVE-2024-55878 is a medium-severity vulnerability with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-3522
Weakness: CWE-79
Published: 2024-12-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2024-55878?: 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.
How severe is CVE-2024-55878?: CVE-2024-55878 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2024-55878 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2024-55878?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-55878 have an EU (EUVD) identifier?: Yes. CVE-2024-55878 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-3522.
When was CVE-2024-55878 published?: CVE-2024-55878 was published on 2024-12-12 and last updated on 2026-06-17.

References

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