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Vulnerability details: VCID-2qqn-59dj-23e3
Vulnerability ID VCID-2qqn-59dj-23e3
Aliases CVE-2026-27977
GHSA-jcc7-9wpm-mj36
Summary next.js: Next.js: null origin can bypass dev HMR websocket CSRF checks
Status Published
Exploitability 0.5
Weighted Severity 3.8
Risk 1.9
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-346 Origin Validation Error
CWE-1385 Missing Origin Validation in WebSockets
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
cvssv3 4.2 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27977.json
epss 6e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-27977
epss 6e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-27977
epss 6e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-27977
cvssv3.1_qr LOW https://github.com/advisories/GHSA-jcc7-9wpm-mj36
cvssv4 2.3 https://github.com/vercel/next.js
generic_textual LOW https://github.com/vercel/next.js
cvssv4 2.3 https://github.com/vercel/next.js/commit/862f9b9bb41d235e0d8cf44aa811e7fd118cee2a
generic_textual LOW https://github.com/vercel/next.js/commit/862f9b9bb41d235e0d8cf44aa811e7fd118cee2a
ssvc Track https://github.com/vercel/next.js/commit/862f9b9bb41d235e0d8cf44aa811e7fd118cee2a
cvssv4 2.3 https://github.com/vercel/next.js/releases/tag/v16.1.7
generic_textual LOW https://github.com/vercel/next.js/releases/tag/v16.1.7
ssvc Track https://github.com/vercel/next.js/releases/tag/v16.1.7
cvssv3.1_qr LOW https://github.com/vercel/next.js/security/advisories/GHSA-jcc7-9wpm-mj36
cvssv4 2.3 https://github.com/vercel/next.js/security/advisories/GHSA-jcc7-9wpm-mj36
generic_textual LOW https://github.com/vercel/next.js/security/advisories/GHSA-jcc7-9wpm-mj36
ssvc Track https://github.com/vercel/next.js/security/advisories/GHSA-jcc7-9wpm-mj36
cvssv4 2.3 https://nvd.nist.gov/vuln/detail/CVE-2026-27977
generic_textual LOW https://nvd.nist.gov/vuln/detail/CVE-2026-27977
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27977.json
https://api.first.org/data/v1/epss?cve=CVE-2026-27977
https://github.com/vercel/next.js
https://github.com/vercel/next.js/commit/862f9b9bb41d235e0d8cf44aa811e7fd118cee2a
https://github.com/vercel/next.js/releases/tag/v16.1.7
https://github.com/vercel/next.js/security/advisories/GHSA-jcc7-9wpm-mj36
https://nvd.nist.gov/vuln/detail/CVE-2026-27977
2448514 https://bugzilla.redhat.com/show_bug.cgi?id=2448514
GHSA-jcc7-9wpm-mj36 https://github.com/advisories/GHSA-jcc7-9wpm-mj36
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27977.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://github.com/vercel/next.js
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

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://github.com/vercel/next.js/commit/862f9b9bb41d235e0d8cf44aa811e7fd118cee2a
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

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-18T19:56:08Z/ Found at https://github.com/vercel/next.js/commit/862f9b9bb41d235e0d8cf44aa811e7fd118cee2a
Vector: 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 Found at https://github.com/vercel/next.js/releases/tag/v16.1.7
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

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-18T19:56:08Z/ Found at https://github.com/vercel/next.js/releases/tag/v16.1.7
Vector: 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 Found at https://github.com/vercel/next.js/security/advisories/GHSA-jcc7-9wpm-mj36
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

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-18T19:56:08Z/ Found at https://github.com/vercel/next.js/security/advisories/GHSA-jcc7-9wpm-mj36
Vector: 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 Found at https://nvd.nist.gov/vuln/detail/CVE-2026-27977
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

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.00461
EPSS Score 6e-05
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:33:31.926405+00:00 RedHat Importer Import https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27977.json 38.6.0