Security readout for executives and security teams
Plain-English summary
An unauthenticated attacker can abuse Alfresco document processing to make the transformation service send unintended network requests. This may expose systems or data reachable from that service and could affect confidentiality, integrity, and availability. Exact affected and fixed versions are not included in the supplied evidence.
Executive priority
Treat as an immediate remediation priority because exploitation requires neither authentication nor user interaction and carries a 9.8 CVSS score. Rapidly identify exposed transformation services, consult Hyland's advisory, apply its remediation, and constrain network access while validation proceeds.
Technical view
CVE-2026-26338 is a CWE-918 server-side request forgery vulnerability in Hyland Alfresco transformation components. It is network-accessible, requires no privileges or user interaction, and has low attack complexity. The assigned CVSS 3.1 score is 9.8, with high confidentiality, integrity, and availability impacts.
Likely exposure
Potential exposure exists where Alfresco Transformation Service Enterprise or Alfresco Community Transform Core processes attacker-controlled documents or requests. Internet reachability increases concern, but internal deployments may also be at risk. The supplied version data is insufficient to determine precisely which releases are vulnerable.
Exploitation context
The supplied sources describe unauthenticated SSRF but provide no evidence of active exploitation. CVE-2026-26338 is not identified as a CISA KEV entry in the bundle. No public exploit availability or observed campaign information is established here.
Researcher notes
The bundle identifies the vulnerable function and severity but does not provide reliable affected-version boundaries, fixed releases, root-cause details, or exploitation telemetry. The supplied affected entries contain version value "0" with default status "unaffected," which is insufficient for definitive version mapping. Validate versions exclusively against current Hyland guidance.
Mitigation direction
- Review Hyland's security update and apply its specified patched release or remediation.
- Restrict transformation and document-processing interfaces to trusted systems and users.
- Limit outbound network access from transformation services to required destinations only.
- Monitor vendor guidance for clarified affected and fixed version ranges.
Validation and detection
- Inventory Alfresco Transformation Service Enterprise and Community Transform Core deployments.
- Record deployed versions and compare them with Hyland's current security advisory.
- Confirm document-processing endpoints are not unnecessarily exposed to untrusted networks.
- Review transformation-service outbound requests for unexpected internal or external destinations.
- Verify outbound filtering prevents access to sensitive network resources.
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 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.