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20 vulnerabilities found for svelte by sveltejs
CVE-2026-42599 (GCVE-0-2026-42599)
Vulnerability from nvd – Published: 2026-06-09 16:22 – Updated: 2026-06-09 18:39
VLAI
Title
Cross-site scripting via spread attributes in Svelte SSR
Summary
Svelte is a performance oriented web framework. Prior to version 5.55.7, when using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. Note that this vulnerability only triggers if the user's browser has JavaScript enabled but Svelte's hydration mechanism does not reach the vulnerable element before the event fires. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-42573 (GCVE-0-2026-42573)
Vulnerability from nvd – Published: 2026-06-09 16:21 – Updated: 2026-06-30 12:08
VLAI
Title
Svelte: XSS via DOM Clobbering of Internal Framework State
Summary
Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-42573 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2487093 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| sveltejs | svelte |
Affected:
< 5.55.7
|
|
| Red Hat | Red Hat Build of Podman Desktop |
cpe:/a:redhat:podman_desktop:1 |
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CVE-2026-42567 (GCVE-0-2026-42567)
Vulnerability from nvd – Published: 2026-06-09 16:22 – Updated: 2026-06-09 18:09
VLAI
Title
Svelte: ReDoS in `<svelte:element>` Tag Validation
Summary
Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-27902 (GCVE-0-2026-27902)
Vulnerability from nvd – Published: 2026-02-26 00:58 – Updated: 2026-02-26 18:51
VLAI
Title
Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers
Summary
Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/0298e97… | x_refsource_MISC |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-27901 (GCVE-0-2026-27901)
Vulnerability from nvd – Published: 2026-02-26 00:57 – Updated: 2026-02-26 14:31
VLAI
Title
Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`
Summary
Svelte performance oriented web framework. Prior to version 5.53.5, the contents of `bind:innerText` and `bind:textContent` on `contenteditable` elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the binding's initial value on the server. Version 5.53.5 fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/0df5abc… | x_refsource_MISC |
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CVE-2026-27125 (GCVE-0-2026-27125)
Vulnerability from nvd – Published: 2026-02-20 22:29 – Updated: 2026-02-25 21:33
VLAI
Title
Svelte SSR attribute spreading includes inherited properties from prototype chain
Summary
svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g. <div {...attrs}>) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a precondition outside of Svelte's control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/73098bb… | x_refsource_MISC |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-27122 (GCVE-0-2026-27122)
Vulnerability from nvd – Published: 2026-02-20 22:28 – Updated: 2026-02-23 19:23
VLAI
Title
Svelte SSR does not validate dynamic element tag names in `<svelte:element>`
Summary
svelte performance oriented web framework. Prior to 5.51.5, 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. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2026-27121 (GCVE-0-2026-27121)
Vulnerability from nvd – Published: 2026-02-20 22:27 – Updated: 2026-02-23 19:34
VLAI
Title
Svelte affected by cross-site scripting via spread attributes in Svelte SSR
Summary
svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2026-27119 (GCVE-0-2026-27119)
Vulnerability from nvd – Published: 2026-02-20 22:25 – Updated: 2026-02-23 19:42
VLAI
Title
Svelte affected by XSS in SSR `<option>` element
Summary
svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2024-45047 (GCVE-0-2024-45047)
Vulnerability from nvd – Published: 2024-08-30 16:55 – Updated: 2024-08-30 18:11
VLAI
Title
Potential mXSS vulnerability due to improper HTML escaping in svelte
Summary
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.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2026-42599 (GCVE-0-2026-42599)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:22 – Updated: 2026-06-09 18:39
VLAI
Title
Cross-site scripting via spread attributes in Svelte SSR
Summary
Svelte is a performance oriented web framework. Prior to version 5.55.7, when using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. Note that this vulnerability only triggers if the user's browser has JavaScript enabled but Svelte's hydration mechanism does not reach the vulnerable element before the event fires. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-42567 (GCVE-0-2026-42567)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:22 – Updated: 2026-06-09 18:09
VLAI
Title
Svelte: ReDoS in `<svelte:element>` Tag Validation
Summary
Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2026-42573 (GCVE-0-2026-42573)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:21 – Updated: 2026-06-30 12:08
VLAI
Title
Svelte: XSS via DOM Clobbering of Internal Framework State
Summary
Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-42573 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2487093 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| sveltejs | svelte |
Affected:
< 5.55.7
|
|
| Red Hat | Red Hat Build of Podman Desktop |
cpe:/a:redhat:podman_desktop:1 |
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CVE-2026-27902 (GCVE-0-2026-27902)
Vulnerability from cvelistv5 – Published: 2026-02-26 00:58 – Updated: 2026-02-26 18:51
VLAI
Title
Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers
Summary
Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/0298e97… | x_refsource_MISC |
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CVE-2026-27901 (GCVE-0-2026-27901)
Vulnerability from cvelistv5 – Published: 2026-02-26 00:57 – Updated: 2026-02-26 14:31
VLAI
Title
Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`
Summary
Svelte performance oriented web framework. Prior to version 5.53.5, the contents of `bind:innerText` and `bind:textContent` on `contenteditable` elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the binding's initial value on the server. Version 5.53.5 fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/0df5abc… | x_refsource_MISC |
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CVE-2026-27125 (GCVE-0-2026-27125)
Vulnerability from cvelistv5 – Published: 2026-02-20 22:29 – Updated: 2026-02-25 21:33
VLAI
Title
Svelte SSR attribute spreading includes inherited properties from prototype chain
Summary
svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g. <div {...attrs}>) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a precondition outside of Svelte's control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/73098bb… | x_refsource_MISC |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-27122 (GCVE-0-2026-27122)
Vulnerability from cvelistv5 – Published: 2026-02-20 22:28 – Updated: 2026-02-23 19:23
VLAI
Title
Svelte SSR does not validate dynamic element tag names in `<svelte:element>`
Summary
svelte performance oriented web framework. Prior to 5.51.5, 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. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2026-27121 (GCVE-0-2026-27121)
Vulnerability from cvelistv5 – Published: 2026-02-20 22:27 – Updated: 2026-02-23 19:34
VLAI
Title
Svelte affected by cross-site scripting via spread attributes in Svelte SSR
Summary
svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2026-27119 (GCVE-0-2026-27119)
Vulnerability from cvelistv5 – Published: 2026-02-20 22:25 – Updated: 2026-02-23 19:42
VLAI
Title
Svelte affected by XSS in SSR `<option>` element
Summary
svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2024-45047 (GCVE-0-2024-45047)
Vulnerability from cvelistv5 – Published: 2024-08-30 16:55 – Updated: 2024-08-30 18:11
VLAI
Title
Potential mXSS vulnerability due to improper HTML escaping in svelte
Summary
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.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
Impacted products
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