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.

CVSS 4.0

5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 22% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2026-07-06

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

Affected

• gohugo:hugo

Packages (OSV)

References

• https://github.com/gohugoio/hugo/commit/ce1a7e0bce3713af40496ded3c2c0ceeed49231d
• https://github.com/gohugoio/hugo/pull/15051
• https://github.com/gohugoio/hugo/releases/tag/v0.163.3
• https://github.com/gohugoio/hugo/security/advisories/GHSA-q76j-gcg9-vxc6

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