Reflected XSS via incomplete redirect URL encoding
Published Jun 12, 2026 · Updated Jun 12, 2026
Reflected XSS in Nuxt 3.4.3 through 3.21.5 and 4.0.0-alpha.1 through 4.4.5 allows remote attackers to run script via redirects. The SSR path in packages/nuxt/src/app/composables/router.ts inserts the external destination into a meta-refresh content attribute after encoding only double quotes, so angle brackets terminate the attribute and introduce attacker-supplied elements. Exploitation requires an application to pass attacker-controlled input to navigateTo() with external enabled and a victim to load the resulting redirect response; injected JavaScript then runs under the application origin.
Summary
What happened
Reflected XSS in Nuxt 3.4.3 through 3.21.5 and 4.0.0-alpha.1 through 4.4.5 allows remote attackers to run script via redirects. The SSR path in packages/nuxt/src/app/composables/router.ts inserts the external destination into a meta-refresh content attribute after encoding only double quotes, so angle brackets terminate the attribute and introduce attacker-supplied elements. Exploitation requires an application to pass attacker-controlled input to navigateTo() with external enabled and a victim to load the resulting redirect response; injected JavaScript then runs under the application origin.
The record
- CVE
- CVE-2026-45669
- Published
- Jun 12, 2026
- Updated
- Jun 12, 2026
- Vendor
- Nuxt
- Product
- Nuxt
- Classifications
- CWE-83, T1059.007
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 12, 2026CVE publishedPublication date reported by the CVE source.
- Jun 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 3.4.3, < 3.21.6
- Affected versionversion=>= 4.0.0-alpha.1, < 4.4.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream navigateTo external redirect proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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