CVE-2026-71315: Auth Bypass (CVSS 8.2)

Description

Nuxt is an open-source web development framework for Vue.js. From 3.21.7 until 3.21.10 and 4.5.1, mixed-case routeRules keys can fail to match case-folded lookups when router.options.sensitive is false and drop appMiddleware authorization gates. This is caused by an incomplete fix for CVE-2026-53721. This issue is fixed in 3.21.10 and 4.5.1.

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CVSS v3.1 Score

8.2

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-178 CWE-178

CWE-863 Incorrect Authorization

References

Other References

https://github.com/nuxt/nuxt/commit/619963309e082190bac4a26b05f2dd155b039b81 https://github.com/nuxt/nuxt/commit/ad624a75ad2d215f43633f6b40be346a7194d34d https://github.com/nuxt/nuxt/releases/tag/v3.21.10 https://github.com/nuxt/nuxt/releases/tag/v4.5.1 https://github.com/nuxt/nuxt/security/advisories/GHSA-hxvh-4h3w-prp9

Frequently Asked Questions

What is CVE-2026-71315? +

Nuxt is an open-source web development framework for Vue.js. From 3.21.7 until 3.21.10 and 4.5.1, mixed-case routeRules keys can fail to match case-folded lookups when router.options.sensitive is false and drop appMiddleware authorization gates. This is caused by an incomplete fix for CVE-2026-53721. This issue is fixed in 3.21.10 and 4.5.1. It has a CVSS v3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-71315? +

CVE-2026-71315 has a CVSS v3.1 score of 8.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-71315? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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