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Vulnerabilities

Vulnerability · CVE-2025-15265

An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable.

Published Jan 15, 2026 · catalog updated Jan 15, 2026 · Svelte

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-15265. EPSS is 0.35%. Act only if a listed version of Svelte is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.35%
Remediation
Version ranges on file
Affected products
vendor Svelte svelte 5.46.0 <5.46.3

An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a block without HTML‑safe escaping, allowing 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Svelte svelte 5.46.0 <5.46.35.46.0 <5.46.3

How to fix CVE-2025-15265

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-15265. EPSS is 0.35%. Act only if a listed version of Svelte is installed.

Which versions are affected?

Compare what you have installed with Svelte svelte 5.46.0 <5.46.3 5.46.0 <5.46.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.35%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 15, 2026 · EUVD

    Detected

    An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a block without HTML‑safe escaping, allowing 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.

  2. Jan 15, 2026 · EUVD

    Updated

    An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a block without HTML‑safe escaping, allowing 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.

Sources

  • CVE.orgVulnerability recordCVE-2025-15265

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-15265

    30-day exploitation probability 0.35%

    first.org
  • EUVDVulnerability recordEUVD-2026-2733

    An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a block without HTML‑safe escaping, allowing to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, w

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • EUVDNov 5, 2026
  • CVE.orgOct 30, 2026