Alfresco Transformation Service (Enterprise): Absolute Path Traversal
CVE-2026-26337 is a high-severity absolute path traversal vulnerability in Alfresco Transformation Service (Enterprise) from Hyland, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 4.3.0 as the first without the flaw, so updating Alfresco Transformation Service (Enterprise) to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.41% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Alfresco Transformation Service (Enterprise) to 4.3.0 or a later version.
- Update Alfresco Community (Transform Core) to 5.3.0 or a later version.
- Update Alfresco Transform Service to 4.3 or a later version.
- Read the advisory on connect.hyland.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Hyland | Alfresco Transformation Service (Enterprise) | before 4.3.0 | 4.3.0 |
| Hyland | Alfresco Community (Transform Core) | before 5.3.0 | 5.3.0 |
| Hyland | Alfresco Transform Service | before 4.3 | 4.3 |
| Hyland | Alfresco Transform Core | before 5.3.0; 5.3.0 | 5.3.0 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- LowLimited modification of data is possible.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N. Scored by CNA (vulncheck.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.8 | High | CNA (vulncheck.com) |
| CVSS 3.1 | 8.2 | High | CNA (vulncheck.com) |
Official description
Hyland Alfresco Transformation Service allows unauthenticated attackers to achieve both arbitrary file read and server-side request forgery through the absolute path traversal.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Absolute Path Traversal
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as /abs/path that can resolve to a location that is outside of that directory.
How developers prevent this class of flaw
- Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
Other references
Other vulnerabilities in Alfresco Transformation Service (Enterprise)
- 9.8 Critical severity
- 9.8 Critical severity
Recent Absolute Path Traversal vulnerabilities
- 7.5 High severity
- 9.8 Critical severity
- 8.0 High severity
- 7.1 High severity
- 8.1 High severity
- 8.8 High severity
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