FreeFlow Core: Improper Restriction of XML External Entity Reference
CVE-2025-8355 is a high-severity improper restriction of XML external entity reference vulnerability in FreeFlow Core from Xerox, with a CVSS 3.1 base score of 7.5 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 8.0.5 as the first without the flaw, so updating FreeFlow Core to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 10.7% chance of exploitation within 30 days, which is in the top 4.11% of all scored CVEs.
EPSS places it among the vulnerabilities most likely to be exploited soon.
What to do
- Update FreeFlow Core to 8.0.5 or a later version.
- Read the advisory on securitydocs.business.xerox.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 |
|---|---|---|---|
| Xerox | FreeFlow Core | before 8.0.5 | 8.0.5 |
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
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | CNA |
| CVSS 3.1 | 7.5 | High | NVD |
Official description
In Xerox FreeFlow Core version 8.0.4, improper handling of XML input allows injection of external entities. An attacker can craft malicious XML containing references to internal URLs, this results in a Server-Side Request Forgery (SSRF).
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Restriction of XML External Entity Reference
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
How developers prevent this class of flaw
- Many XML parsers and validators can be configured to disable external entity expansion.
More Improper Restriction of XML External Entity Reference vulnerabilities (CWE-611)
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
Other vulnerabilities in FreeFlow Core
- 7.5 High severity
- 9.8 Critical severity
- 9.8 Critical severity
Recent Improper Restriction of XML External Entity Reference vulnerabilities
- 8.6 High severity
- 9.8 Critical severity
- 8.0 High severity
- 9.8 Critical severity
- 8.8 High severity
- 9.3 Critical severity
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