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Vulnerability details: VCID-eccr-c8xw-rqcn
Vulnerability ID VCID-eccr-c8xw-rqcn
Aliases CVE-2025-15265
GHSA-6738-r8g5-qwp3
Summary An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a <script> block without HTML‑safe escaping, allowing </script> to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, with potential for session theft and account compromise. This issue affects Svelte: from 5.46.0 before 5.46.3.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
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
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-15265.json
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2025-15265
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2025-15265
epss 8e-05 https://api.first.org/data/v1/epss?cve=CVE-2025-15265
epss 8e-05 https://api.first.org/data/v1/epss?cve=CVE-2025-15265
cvssv4 5.3 https://fluidattacks.com/advisories/lydian
generic_textual MODERATE https://fluidattacks.com/advisories/lydian
ssvc Track https://fluidattacks.com/advisories/lydian
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-6738-r8g5-qwp3
cvssv4 5.3 https://github.com/sveltejs/svelte
generic_textual MODERATE https://github.com/sveltejs/svelte
cvssv4 5.3 https://github.com/sveltejs/svelte/commit/ef81048e238844b729942441541d6dcfe6c8ccca
generic_textual MODERATE https://github.com/sveltejs/svelte/commit/ef81048e238844b729942441541d6dcfe6c8ccca
cvssv4 5.3 https://github.com/sveltejs/svelte/releases/tag/svelte%405.46.4
generic_textual MODERATE https://github.com/sveltejs/svelte/releases/tag/svelte%405.46.4
cvssv3.1_qr MODERATE https://github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3
cvssv4 5.3 https://github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3
generic_textual MODERATE https://github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3
ssvc Track https://github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3
cvssv4 5.3 https://nvd.nist.gov/vuln/detail/CVE-2025-15265
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2025-15265
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-15265.json
https://api.first.org/data/v1/epss?cve=CVE-2025-15265
https://github.com/sveltejs/svelte
https://github.com/sveltejs/svelte/commit/ef81048e238844b729942441541d6dcfe6c8ccca
https://github.com/sveltejs/svelte/releases/tag/svelte%405.46.4
2430177 https://bugzilla.redhat.com/show_bug.cgi?id=2430177
CVE-2025-15265 https://nvd.nist.gov/vuln/detail/CVE-2025-15265
GHSA-6738-r8g5-qwp3 https://github.com/advisories/GHSA-6738-r8g5-qwp3
GHSA-6738-r8g5-qwp3 https://github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3
lydian https://fluidattacks.com/advisories/lydian
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-15265.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:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://fluidattacks.com/advisories/lydian
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:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-15T20:28:05Z/ Found at https://fluidattacks.com/advisories/lydian
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/sveltejs/svelte/commit/ef81048e238844b729942441541d6dcfe6c8ccca
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:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/sveltejs/svelte/releases/tag/svelte%405.46.4
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:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3
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:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-15T20:28:05Z/ Found at https://github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2025-15265
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 0.04388
EPSS Score 0.00017
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T17:00:05.800225+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2025/15xxx/CVE-2025-15265.json 38.6.0