Assessment
Why it matters
EPSS is 0.4%; technical severity is CVSS 9.8.
CWE-284: Improper Access Control in web services in Progress Sitefinity 15.4.8623 before 15.4.8630 allows a remote unauthenticated attacker to access content that should be restricted, resulting in full compromise of confidentiality, integrity, and availability of affected installations.
Who should care
- Teams operating Sitefinity
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Sitefinity is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Vendor advisory from community.progress.com
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-284
- Affected versions
- Progress Sitefinity (Start Including 15.4.8623, End Excluding 15.4.8630)
- Fixed versions
- Progress Sitefinity (Fixed from 15.4.8630)
- Published
- 2 June 2026
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Latest EPSS score: 0.4%
- Signal calculated at 14