How severe is CVE-2026-9255?

CVE-2026-9255 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-9255 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-9255?

CVE-2026-9255 affects Amazon Kiro Cli. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-9255?

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-2026-9255 have an EU (EUVD) identifier?

Yes. CVE-2026-9255 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31471.

When was CVE-2026-9255 published?

CVE-2026-9255 was published on 2026-05-22 and last updated on 2026-06-17.

CVE-2026-9255

CVE-2026-9255 is a high-severity vulnerability in Amazon Kiro Cli with a CVSS 3.x base score of 7.8. 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-862.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 8.4
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31471
Weakness: CWE-862
Affected product: Amazon Kiro Cli
Published: 2026-05-22
Last modified: 2026-06-17

Description

Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local attacker to execute arbitrary tools, including shell commands, without user approval by crafting content that is piped to kiro-cli via stdin. We recommend you to upgrade to kiro-cli version 1.28.0 or later.

Frequently asked questions

What is CVE-2026-9255?: Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local attacker to execute arbitrary tools, including shell commands, without user approval by crafting content that is piped to kiro-cli via stdin. We recommend you to upgrade to kiro-cli version 1.28.0 or later.
How severe is CVE-2026-9255?: CVE-2026-9255 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-9255 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-9255?: CVE-2026-9255 affects Amazon Kiro Cli. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-9255?: 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-2026-9255 have an EU (EUVD) identifier?: Yes. CVE-2026-9255 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31471.
When was CVE-2026-9255 published?: CVE-2026-9255 was published on 2026-05-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:amazon:kiro_cli:*:*:*:*:*:*:*:*

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