Security readout for executives and security teams
Plain-English summary
This CVE describes unauthenticated remote code execution in Hyland Alfresco document transformation functionality. An attacker may not need an account or user interaction. The supplied metadata rates it critical at CVSS 9.8, but does not provide affected or fixed version detail in the bundle.
Executive priority
Prioritize this as a critical remediation item for any Alfresco environment using transformation services, especially where document processing is reachable from untrusted networks.
Technical view
The reported issue is argument injection in Hyland Alfresco Transformation Service document processing, leading to remote code execution. The CVE metadata lists network access, low complexity, no privileges, and no user interaction. CWE is listed as CWE-918 in the supplied record, though the title and description describe argument injection RCE.
Likely exposure
Likely exposure is organizations running Hyland Alfresco Transformation Service Enterprise or Alfresco Community Transform Core. The bundle does not identify precise affected versions beyond placeholder version data, so teams must verify product versions against Hyland’s advisory.
Exploitation context
The source bundle does not cite active exploitation, and KEV status is false. Treat the issue as urgent because it is unauthenticated, network-reachable RCE with high confidentiality, integrity, and availability impact.
Researcher notes
Evidence supports critical unauthenticated RCE, but the supplied affected-version data is incomplete and internally sparse. Do not assume all Alfresco installations are affected without checking Hyland’s advisory and the deployed transformation architecture.
Mitigation direction
- Review Hyland’s advisory for affected and fixed version details.
- Apply Hyland-supported patches or updates for vulnerable Alfresco transformation components.
- Identify and reduce unnecessary exposure of transformation services.
- Use vendor guidance for any temporary compensating controls.
- Monitor Hyland and CVE updates for corrected affected-version detail.
Validation and detection
- Inventory Alfresco Transformation Service and Transform Core deployments.
- Compare installed component versions with Hyland’s advisory.
- Confirm document transformation endpoints are not unnecessarily internet-exposed.
- Review logs for unusual document transformation activity.
- Verify patch status after remediation through standard asset tooling.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-26339 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: 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
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://connect.hyland.com/t5/alfresco-blog/security-update-cve-2026-26337-cve-2026-26338-cve-2026-26339/ba-p/496551CVE reference, VulnCheck · vendor-advisory, patch
- https://www.hyland.com/en/solutions/products/alfresco-platformCVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/hyland-alfresco-transformation-service-argument-injection-rceCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.