Session-bound request forgery via text/plain bypass
Published Apr 4, 2023 · Updated Feb 10, 2025
Cross-site request forgery in SvelteKit before 1.15.1 allows remote attackers to submit endpoint operations in a victim's session. The server-side CSRF check calls is_form_content_type, which omits text/plain and therefore processes a cross-origin form POST instead of rejecting it. Exploitation requires user interaction, an active victim session, and a state-changing endpoint that relies on the built-in protection.
Summary
What happened
Cross-site request forgery in SvelteKit before 1.15.1 allows remote attackers to submit endpoint operations in a victim's session. The server-side CSRF check calls is_form_content_type, which omits text/plain and therefore processes a cross-origin form POST instead of rejecting it. Exploitation requires user interaction, an active victim session, and a state-changing endpoint that relies on the built-in protection.
The record
- CVE
- CVE-2023-29003
- Published
- Apr 4, 2023
- Updated
- Feb 10, 2025
- Vendor
- Svelte
- Product
- SvelteKit
- Classifications
- CWE-184, CWE-352
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 4, 2023CVE publishedPublication date reported by the CVE source.
- Feb 10, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.15.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Doyensec SvelteKit CSRF protection bypass proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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