How severe is CVE-2016-9487?

CVE-2016-9487 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-9487 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-9487?

CVE-2016-9487 affects W3 Epubcheck. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-9487?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-9487 published?

CVE-2016-9487 was published on 2018-07-13 and last updated on 2026-06-17.

CVE-2016-9487

CVE-2016-9487 is a high-severity vulnerability in W3 Epubcheck with a CVSS 3.x base score of 7.8. 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-611.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: W3 Epubcheck
Published: 2018-07-13
Last modified: 2026-06-17

Description

EpubCheck 4.0.1 does not properly restrict resolving external entities when parsing XML in EPUB files during validation. An attacker who supplies a specially crafted EPUB file may be able to exploit this behavior to read arbitrary files, or have the victim execute arbitrary requests on his behalf, abusing the victim's trust relationship with other entities.

Frequently asked questions

What is CVE-2016-9487?: EpubCheck 4.0.1 does not properly restrict resolving external entities when parsing XML in EPUB files during validation. An attacker who supplies a specially crafted EPUB file may be able to exploit this behavior to read arbitrary files, or have the victim execute arbitrary requests on his behalf, abusing the victim's trust relationship with other entities.
How severe is CVE-2016-9487?: CVE-2016-9487 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-9487 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-9487?: CVE-2016-9487 affects W3 Epubcheck. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-9487?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-9487 published?: CVE-2016-9487 was published on 2018-07-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:w3:epubcheck:4.0.1:*:*:*:*:*:*:*

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