CVE-2023-29008Public exploitNetwork attack vector

Session action forgery via case-sensitive Content-Type check

Published Apr 6, 2023 · Updated Feb 10, 2025

CSRF in SvelteKit before 1.15.2 allows remote attackers to submit state-changing requests through an authenticated user's browser. The is_form_content_type helper compares Content-Type case-sensitively, so a mixed-case simple type such as text/plaiN bypasses origin enforcement. Exploitation requires a malicious-site visit while session cookies are sent cross-site, allowing forged endpoint operations in that session.

CVSS severity4.7
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in SvelteKit before 1.15.2 allows remote attackers to submit state-changing requests through an authenticated user's browser. The is_form_content_type helper compares Content-Type case-sensitively, so a mixed-case simple type such as text/plaiN bypasses origin enforcement. Exploitation requires a malicious-site visit while session cookies are sent cross-site, allowing forged endpoint operations in that session.

The record

CVE
CVE-2023-29008
Published
Apr 6, 2023
Updated
Feb 10, 2025
Vendor
Svelte
Product
SvelteKit
Classifications
CWE-352, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2023CVE publishedPublication date reported by the CVE source.
  2. 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.

  1. Affected versionversion=< 1.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Svelte · SvelteKitversion=< 1.15.2

Published CVSS scores

8.8GitHub CNA recordCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.7GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1189Drive-by Compromise

Public exploit references

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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