How severe is CVE-2026-26339?

CVE-2026-26339 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-26339 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26339?

CVE-2026-26339 primarily affects Hyland Alfresco Transform Service. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-26339?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-26339 have an EU (EUVD) identifier?

Yes. CVE-2026-26339 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7801.

When was CVE-2026-26339 published?

CVE-2026-26339 was published on 2026-02-19 and last updated on 2026-06-17.

CVE-2026-26339

CVE-2026-26339 is a critical-severity vulnerability in Hyland Alfresco Transform Service with a CVSS 3.x base score of 9.8. 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-918.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7801
Weakness: CWE-918
Affected product: Hyland Alfresco Transform Service
Published: 2026-02-19
Last modified: 2026-06-17

Description

Hyland Alfresco Transformation Service allows unauthenticated attackers to achieve remote code execution through the argument injection vulnerability, which exists in the document processing functionality.

Frequently asked questions

What is CVE-2026-26339?: Hyland Alfresco Transformation Service allows unauthenticated attackers to achieve remote code execution through the argument injection vulnerability, which exists in the document processing functionality.
How severe is CVE-2026-26339?: CVE-2026-26339 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-26339 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26339?: CVE-2026-26339 primarily affects Hyland Alfresco Transform Service. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-26339?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-26339 have an EU (EUVD) identifier?: Yes. CVE-2026-26339 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7801.
When was CVE-2026-26339 published?: CVE-2026-26339 was published on 2026-02-19 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:hyland:alfresco_transform_service:*:*:*:*:*:*:*:*
cpe:2.3:a:hyland:alfresco_transform_core:*:*:*:*:*:*:*:*

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