How severe is CVE-2026-25723?

CVE-2026-25723 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-25723 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25723?

CVE-2026-25723 affects Anthropic Claude Code. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25723?

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

Does CVE-2026-25723 have an EU (EUVD) identifier?

Yes. CVE-2026-25723 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5637.

When was CVE-2026-25723 published?

CVE-2026-25723 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2026-25723

CVE-2026-25723 is a medium-severity vulnerability in Anthropic Claude Code with a CVSS 3.x base score of 6.5. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.7
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5637
Weakness: CWE-20
Affected product: Anthropic Claude Code
Published: 2026-02-06
Last modified: 2026-06-17

Description

Claude Code is an agentic coding tool. Prior to version 2.0.55, Claude Code failed to properly validate commands using piped sed operations with the echo command, allowing attackers to bypass file write restrictions. This vulnerability enabled writing to sensitive directories like the .claude folder and paths outside the project scope. Exploiting this required the ability to execute commands through Claude Code with the "accept edits" feature enabled. This issue has been patched in version 2.0.55.

Frequently asked questions

What is CVE-2026-25723?: Claude Code is an agentic coding tool. Prior to version 2.0.55, Claude Code failed to properly validate commands using piped sed operations with the echo command, allowing attackers to bypass file write restrictions. This vulnerability enabled writing to sensitive directories like the .claude folder and paths outside the project scope. Exploiting this required the ability to execute commands through Claude Code with the "accept edits" feature enabled. This issue has been patched in version 2.0.55.
How severe is CVE-2026-25723?: CVE-2026-25723 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-25723 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25723?: CVE-2026-25723 affects Anthropic Claude Code. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25723?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25723 have an EU (EUVD) identifier?: Yes. CVE-2026-25723 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5637.
When was CVE-2026-25723 published?: CVE-2026-25723 was published on 2026-02-06 and last updated on 2026-06-17.

References

https://github.com/anthropics/claude-code/security/advisories/GHSA-mhg7-666j-cqg4

Affected products (1)

cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:*

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