How severe is CVE-2025-54135?

CVE-2025-54135 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-54135 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54135?

CVE-2025-54135 affects Anysphere Cursor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-54135?

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-2025-54135 have an EU (EUVD) identifier?

Yes. CVE-2025-54135 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23569.

When was CVE-2025-54135 published?

CVE-2025-54135 was published on 2025-08-05 and last updated on 2026-06-17.

CVE-2025-54135

CVE-2025-54135 is a high-severity vulnerability in Anysphere Cursor with a CVSS 3.x base score of 8.5. 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-78.

Key facts

Severity: High (CVSS 3.x base score 8.5)
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-23569
Weakness: CWE-78
Affected product: Anysphere Cursor
Published: 2025-08-05
Last modified: 2026-06-17

Description

Cursor is a code editor built for programming with AI. Cursor allows writing in-workspace files with no user approval in versions below 1.3.9, If the file is a dotfile, editing it requires approval but creating a new one doesn't. Hence, if sensitive MCP files, such as the .cursor/mcp.json file don't already exist in the workspace, an attacker can chain a indirect prompt injection vulnerability to hijack the context to write to the settings file and trigger RCE on the victim without user approval. This is fixed in version 1.3.9.

Frequently asked questions

What is CVE-2025-54135?: Cursor is a code editor built for programming with AI. Cursor allows writing in-workspace files with no user approval in versions below 1.3.9, If the file is a dotfile, editing it requires approval but creating a new one doesn't. Hence, if sensitive MCP files, such as the .cursor/mcp.json file don't already exist in the workspace, an attacker can chain a indirect prompt injection vulnerability to hijack the context to write to the settings file and trigger RCE on the victim without user approval. This is fixed in version 1.3.9.
How severe is CVE-2025-54135?: CVE-2025-54135 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-54135 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54135?: CVE-2025-54135 affects Anysphere Cursor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-54135?: 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-2025-54135 have an EU (EUVD) identifier?: Yes. CVE-2025-54135 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23569.
When was CVE-2025-54135 published?: CVE-2025-54135 was published on 2025-08-05 and last updated on 2026-06-17.

References

https://github.com/cursor/cursor/security/advisories/GHSA-4cxx-hrm3-49rm

Affected products (1)

cpe:2.3:a:anysphere:cursor:*:*:*:*:*:*:*:*

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