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Vulnerability details: VCID-uefh-sv4n-2kd4
Vulnerability ID VCID-uefh-sv4n-2kd4
Aliases CVE-2026-31860
GHSA-g5xx-pwrp-g3fv
Summary Unhead is a document head and template manager. Prior to 2.1.11, useHeadSafe() can be bypassed to inject arbitrary HTML attributes, including event handlers, into SSR-rendered <head> tags. This is the composable that Nuxt docs recommend for safely handling user-generated content. The acceptDataAttrs function (safe.ts, line 16-20) allows any property key starting with data- through to the final HTML. It only checks the prefix, not whether the key contains spaces or other characters that break HTML attribute parsing. This vulnerability is fixed in 2.1.11.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.0002 https://api.first.org/data/v1/epss?cve=CVE-2026-31860
cvssv4 5.3 https://github.com/unjs/unhead
generic_textual MODERATE https://github.com/unjs/unhead
cvssv4 5.3 https://github.com/unjs/unhead/commit/9ecc4f9568b0e23938f36d4b23fcfa4a18a89045
generic_textual MODERATE https://github.com/unjs/unhead/commit/9ecc4f9568b0e23938f36d4b23fcfa4a18a89045
cvssv4 5.3 https://github.com/unjs/unhead/releases/tag/v2.1.11
generic_textual MODERATE https://github.com/unjs/unhead/releases/tag/v2.1.11
cvssv4 5.3 https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv
generic_textual MODERATE https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv
ssvc Track https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv
cvssv4 5.3 https://nvd.nist.gov/vuln/detail/CVE-2026-31860
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-31860
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-31860
https://github.com/unjs/unhead
https://github.com/unjs/unhead/commit/9ecc4f9568b0e23938f36d4b23fcfa4a18a89045
https://github.com/unjs/unhead/releases/tag/v2.1.11
https://nvd.nist.gov/vuln/detail/CVE-2026-31860
GHSA-g5xx-pwrp-g3fv https://github.com/advisories/GHSA-g5xx-pwrp-g3fv
GHSA-g5xx-pwrp-g3fv https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/unjs/unhead
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/unjs/unhead/commit/9ecc4f9568b0e23938f36d4b23fcfa4a18a89045
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/unjs/unhead/releases/tag/v2.1.11
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

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present

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passive

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-13T16:26:47Z/ Found at https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-31860
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

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Exploit Prediction Scoring System (EPSS)
Percentile 0.05677
EPSS Score 0.0002
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:44:49.955078+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/31xxx/CVE-2026-31860.json 38.6.0