Security readout for executives and security teams
Plain-English summary
CVE-2026-26338 is a critical SSRF issue in Hyland Alfresco Transformation Service document processing. An unauthenticated attacker may be able to make the service send requests to locations chosen by the attacker. Business risk is highest where Alfresco transformation components can reach internal systems, sensitive services, or privileged network locations.
Executive priority
Treat as a priority patch-and-exposure review for any Alfresco transformation environment. Urgency is critical where the service is internet-facing, accepts untrusted documents, or can reach sensitive internal systems.
Technical view
The CVE describes unauthenticated server-side request forgery in Alfresco Transformation Service via document processing functionality. It is scored CVSS 9.8 with network access, low complexity, no privileges, no user interaction, and high confidentiality, integrity, and availability impact. The provided affected-version data is not specific enough to identify exact vulnerable releases.
Likely exposure
Exposure is most likely in deployments using Hyland Alfresco Transformation Service or Alfresco Community Transform Core for document processing, especially if reachable by untrusted users or networks. Exact affected versions are unclear from the provided bundle, so asset owners should verify installed components against Hyland guidance.
Exploitation context
The provided bundle does not show CISA KEV listing and does not cite confirmed active exploitation. The vulnerability is still urgent because it is unauthenticated, network-accessible, and tied to SSRF, which can expose internal services depending on deployment network reachability.
Researcher notes
Evidence supports unauthenticated SSRF and critical CVSS impact, but the bundle lacks precise affected release ranges and remediation version details. Avoid assuming exploitation in the wild unless a cited advisory or KEV entry later confirms it.
Mitigation direction
- Review Hyland’s advisory for affected versions and official patch guidance.
- Apply vendor-provided updates or fixes where Hyland confirms exposure.
- Restrict access to transformation and document processing endpoints.
- Limit outbound network access from Alfresco transformation services.
- Monitor for unusual server-side requests from transformation components.
Validation and detection
- Inventory Alfresco Transformation Service and Transform Core deployments.
- Confirm installed versions and configurations against Hyland’s advisory.
- Check whether document processing endpoints are reachable without authentication.
- Review network egress paths available to transformation services.
- Inspect logs for unexpected requests from Alfresco transformation hosts.
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 lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-26338 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:L/VI:L/VA:N/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/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-ssrfCVE 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.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.