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Vulnerability details: VCID-1p31-6wc5-s7e9
Vulnerability ID VCID-1p31-6wc5-s7e9
Aliases CVE-2026-27122
GHSA-m56q-vw4c-c2cp
Summary Svelte SSR does not validate dynamic element tag names in `<svelte:element>` When using `<svelte:element this={tag}>` in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (4)
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
CWE-1286 Improper Validation of Syntactic Correctness of Input
System Score Found at
cvssv3 5.6 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27122.json
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2026-27122
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-m56q-vw4c-c2cp
cvssv4 5.1 https://github.com/sveltejs/svelte
generic_textual MODERATE https://github.com/sveltejs/svelte
cvssv3.1_qr MODERATE https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp
cvssv4 5.1 https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp
generic_textual MODERATE https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp
ssvc Track https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp
cvssv4 5.1 https://nvd.nist.gov/vuln/detail/CVE-2026-27122
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-27122
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27122.json
https://api.first.org/data/v1/epss?cve=CVE-2026-27122
https://github.com/sveltejs/svelte
2441520 https://bugzilla.redhat.com/show_bug.cgi?id=2441520
CVE-2026-27122 https://nvd.nist.gov/vuln/detail/CVE-2026-27122
GHSA-m56q-vw4c-c2cp https://github.com/advisories/GHSA-m56q-vw4c-c2cp
GHSA-m56q-vw4c-c2cp https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27122.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:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N Found at https://github.com/sveltejs/svelte
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:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N Found at https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp
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/2026-02-23T19:22:44Z/ Found at https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-27122
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 0.01391
EPSS Score 0.00011
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T21:06:43.267351+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/svelte/CVE-2026-27122.yml 38.6.0