CVE-2026-26339
Unauthenticated RCE in Alfresco Transformation Service via argument injection
Is CVE-2026-26339 being exploited?
Not confirmed. CVE-2026-26339 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.54% probability of exploitation in the next 30 days.
How severe is CVE-2026-26339?
CVE-2026-26339 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-26339?
Yes. A fix has been recorded for CVE-2026-26339. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-26339 affect?
CVE-2026-26339 affects Hyland Alfresco Transformation Service, Alfresco Content Services - Transformation Service, Alfresco. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-26339?
Patch when available; restrict access to the service
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated RCE on server via document processing arg injection; attacker can take control of host
Patch when possible
- affected< 5.2.4
- affected< 4.2.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.