How severe is CVE-2026-58402?

CVE-2026-58402 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-58402 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-58402?

CVE-2026-58402 affects Gohugo Hugo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-58402?

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

When was CVE-2026-58402 published?

CVE-2026-58402 was published on 2026-07-06 and last updated on 2026-07-08.

CVE-2026-58402

CVE-2026-58402 is a medium-severity vulnerability in Gohugo Hugo with a CVSS 3.x base score of 5.4. 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 5.4)
CVSS v4: 5.1
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Gohugo Hugo
Published: 2026-07-06
Last modified: 2026-07-08

Description

Hugo is a static site generator. From 0.60.0 until 0.163.3, Hugo's default code-block renderer wrote the Markdown code-fence language or info-string into the code class="language-…" data-lang="…" wrapper without HTML escaping. A fence info-string containing a quote and a script payload breaks out of the attribute and injects a live script element. This issue is fixed in 0.163.3.

Frequently asked questions

What is CVE-2026-58402?: Hugo is a static site generator. From 0.60.0 until 0.163.3, Hugo's default code-block renderer wrote the Markdown code-fence language or info-string into the code class="language-…" data-lang="…" wrapper without HTML escaping. A fence info-string containing a quote and a script payload breaks out of the attribute and injects a live script element. This issue is fixed in 0.163.3.
How severe is CVE-2026-58402?: CVE-2026-58402 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-58402 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-58402?: CVE-2026-58402 affects Gohugo Hugo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-58402?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-58402 published?: CVE-2026-58402 was published on 2026-07-06 and last updated on 2026-07-08.

References

Affected products (1)

cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:*

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