What is the CVSS score of CVE-2025-15265?

CVE-2025-15265 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Svelte are affected by CVE-2025-15265?

CVE-2025-15265 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 6.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users.. A patch is available.

Is there a public PoC exploit available for CVE-2025-15265?

Yes, a public proof-of-concept exploit is available for CVE-2025-15265. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-15265?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Svelte CVE-2025-15265

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-01-15 help@fluidattacks.com

GHSA-6738-r8g5-qwp3

XSS Svelte Red Hat

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Red Hat

6.1 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 23, 2026 - 19:04 vuln.today

Public exploit code

CVE Published

Jan 15, 2026 - 20:16 nvd

MEDIUM 6.1

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1 npm packages depend on svelte (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 5.46.0.

DescriptionCVE.org

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.

AnalysisAI

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Svelte. 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.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

Vendor StatusVendor

CVE-2025-15265 vulnerability details – vuln.today

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