CVE Explorer

CVE-2026-27977

Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and prior to version 16.1.7, in `next dev`, cross-site protection for internal websocket endpoints could treat `Origin: null` as a bypass case even if `allowedDevOrigins` is configured, allowing privacy-sensitive/opaque contexts (for example sandboxed documents) to connect unexpectedly. If a dev server is reachable from attacker-controlled content, an attacker may be able to connect to the HMR webso

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ee4e4dd1d437320814a38971a7059b5c0053308b01e45c19f25c353a1ad20813

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"next.js","vendor":"vercel","versions":[{"status":"affected","version":">= 16.0.1, < 16.1.7"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:01fdbf16cdba14d251f9012b8c2dcd73d16802de6b2bdd54afcd777f2a14f42c · sha256:b94f3e4bbdadb0a7… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:01fdbf16cdba14d251f9012b8c2dcd73d16802de6b2bdd54afcd777f2a14f42c · sha256:b94f3e4bbdadb0a7… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-1385","description":"CWE-1385: Missing Origin Validation in WebSockets","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:01fdbf16cdba14d251f9012b8c2dcd73d16802de6b2bdd54afcd777f2a14f42c · sha256:b94f3e4bbdadb0a7… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/vercel/next.js/commit/862f9b9bb41d235e0d8cf44aa811e7fd118cee2a","tags":["x_refsource_MISC"],"url":"https://github.com/vercel/next.js/commit/862f9b9bb41d235e0d8cf44aa811e7fd118cee2a"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:01fdbf16cdba14d251f9012b8c2dcd73d16802de6b2bdd54afcd777f2a14f42c · sha256:b94f3e4bbdadb0a7… · /containers/cna/references/1

{"name":"https://github.com/vercel/next.js/releases/tag/v16.1.7","tags":["x_refsource_MISC"],"url":"https://github.com/vercel/next.js/releases/tag/v16.1.7"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:01fdbf16cdba14d251f9012b8c2dcd73d16802de6b2bdd54afcd777f2a14f42c · sha256:b94f3e4bbdadb0a7… · /containers/cna/references/2

{"name":"https://github.com/vercel/next.js/security/advisories/GHSA-jcc7-9wpm-mj36","tags":["x_refsource_CONFIRM"],"url":"https://github.com/vercel/next.js/security/advisories/GHSA-jcc7-9wpm-mj36"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:01fdbf16cdba14d251f9012b8c2dcd73d16802de6b2bdd54afcd777f2a14f42c · sha256:b94f3e4bbdadb0a7… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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