How severe is CVE-2024-45047?

CVE-2024-45047 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2024-45047 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-45047?

CVE-2024-45047 affects Svelte. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-45047?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-45047 have an EU (EUVD) identifier?

Yes. CVE-2024-45047 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-2530.

When was CVE-2024-45047 published?

CVE-2024-45047 was published on 2024-08-30 and last updated on 2026-06-17.

CVE-2024-45047

CVE-2024-45047 is a medium-severity vulnerability in Svelte with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-2530
Weakness: CWE-79
Affected product: Svelte
Published: 2024-08-30
Last modified: 2026-06-17

Description

svelte performance oriented web framework. A potential mXSS vulnerability exists in Svelte for versions up to but not including 4.2.19. Svelte improperly escapes HTML on server-side rendering. The assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks, and a type of the XSS is known as mXSS (mutation XSS). More specifically, this can occur when injecting malicious content into an attribute within a `noscript` tag. This issue has been addressed in release version 4.2.19. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Frequently asked questions

What is CVE-2024-45047?: svelte performance oriented web framework. A potential mXSS vulnerability exists in Svelte for versions up to but not including 4.2.19. Svelte improperly escapes HTML on server-side rendering. The assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks, and a type of the XSS is known as mXSS (mutation XSS). More specifically, this can occur when injecting malicious content into an attribute within a `noscript` tag. This issue has been addressed in release version 4.2.19. Users are advised to upgrade. There are no known workarounds for this vulnerability.
How severe is CVE-2024-45047?: CVE-2024-45047 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2024-45047 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-45047?: CVE-2024-45047 affects Svelte. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-45047?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-45047 have an EU (EUVD) identifier?: Yes. CVE-2024-45047 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-2530.
When was CVE-2024-45047 published?: CVE-2024-45047 was published on 2024-08-30 and last updated on 2026-06-17.

References

https://github.com/sveltejs/svelte/security/advisories/GHSA-8266-84wp-wv5c

Affected products (1)

cpe:2.3:a:svelte:svelte:*:*:*:*:*:node.js:*:*

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