VulnerabilityAnalyzed

CVE-2026-58402

A fence info-string containing a quote and a script payload breaks out of the attribute and injects a live script element.

MEDIUM 5.1EPSS 0.30%

Does this matter?

Lower severity and a low EPSS score (0.30%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 5.1 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.30% probability · 23th percentile
CISA KEV: Not listed
Weakness: CWE-79
Affected: gohugo/hugo
Source: security-advisories@github.com

References

https://github.com/gohugoio/hugo/commit/ce1a7e0bce3713af40496ded3c2c0ceeed49231dPatch
https://github.com/gohugoio/hugo/pull/15051Issue Tracking
https://github.com/gohugoio/hugo/releases/tag/v0.163.3Release Notes
https://github.com/gohugoio/hugo/security/advisories/GHSA-q76j-gcg9-vxc6Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.