CVE-2026-24052
CVE-2026-24052 is a high-severity vulnerability in Anthropic Claude Code with a CVSS 3.x base score of 7.4. 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-601.
Key facts
- Severity: High (CVSS 3.x base score 7.4)
- CVSS v4: 7.1
- EPSS exploit prediction: 0% (26th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-5172
- Weakness: CWE-601
- Affected product: Anthropic Claude Code
- Published:
- Last modified:
Description
Claude Code is an agentic coding tool. Prior to version 1.0.111, Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a startsWith() function to validate trusted domains (e.g., docs.python.org, modelcontextprotocol.io), this could have enabled attackers to register domains like modelcontextprotocol.io.example.com that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. This issue has been patched in version 1.0.111.
Frequently asked questions
- What is CVE-2026-24052?
- Claude Code is an agentic coding tool. Prior to version 1.0.111, Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a startsWith() function to validate trusted domains (e.g., docs.python.org, modelcontextprotocol.io), this could have enabled attackers to register domains like modelcontextprotocol.io.example.com that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. This issue has been patched in version 1.0.111.
- How severe is CVE-2026-24052?
- CVE-2026-24052 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2026-24052 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-2026-24052?
- CVE-2026-24052 affects Anthropic Claude Code. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-24052?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-24052 have an EU (EUVD) identifier?
- Yes. CVE-2026-24052 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5172.
- When was CVE-2026-24052 published?
- CVE-2026-24052 was published on 2026-02-03 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:*
More vulnerabilities in Anthropic Claude Code
- CVE-2026-39861 — Critical (CVSS 10.0): Claude Code is an agentic coding tool. Prior to version 2.1.64, Claude Code's sandbox did not prevent sandboxed…
- CVE-2026-25725 — Critical (CVSS 10.0): Claude Code is an agentic coding tool. Prior to version 2.1.2, Claude Code's bubblewrap sandboxing mechanism failed to…
- CVE-2025-66032 — Critical (CVSS 9.8): Claude Code is an agentic coding tool. Prior to 1.0.93, Due to errors in parsing shell commands related to $IFS and…
- CVE-2025-64755 — Critical (CVSS 9.8): Claude Code is an agentic coding tool. Prior to version 2.0.31, due to an error in sed command parsing, it was possible…
- CVE-2025-65099 — Critical (CVSS 9.8): Claude Code is an agentic coding tool. Prior to version 1.0.39, when running on a machine with Yarn 3.0 or above,…
- CVE-2025-59828 — Critical (CVSS 9.8): Claude Code is an agentic coding tool. Prior to Claude Code version 1.0.39, when using Claude Code with Yarn versions…
All CVEs affecting Anthropic Claude Code →
Other CWE-601 (Open Redirect) vulnerabilities
- CVE-2018-3774 — Critical (CVSS 10.0): Incorrect parsing in url-parse <1.4.3 returns wrong hostname which leads to multiple vulnerabilities such as SSRF, Open…
- CVE-2019-25282 — Critical (CVSS 9.8): V-SOL GPON/EPON OLT Platform v2.03 contains an open redirect vulnerability in the script that allows attackers to…
- CVE-2020-36912 — Critical (CVSS 9.8): Plexus anblick Digital Signage Management 3.1.13 contains an open redirect vulnerability in the 'PantallaLogin' script…
- CVE-2025-43526 — Critical (CVSS 9.8): This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac…
- CVE-2025-55031 — Critical (CVSS 9.8): Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An…
- CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.