Assessment
Why it matters
EPSS is 0.3%; technical severity is CVSS 8.8.
CWE-639: Authorization Bypass Through User-Controlled Key in web services in Progress Sitefinity 15.2.x before 15.2.8441, 15.3.x before 15.3.8531, and 15.4.x before 15.4.8630 allows a remote authenticated attacker to modify account properties of other users, potentially leading to account compromise. Successful exploitation requires knowledge of values that are not generally exposed to low-privileged users.
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:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-639
- Affected versions
- Progress Sitefinity (Start Including 15.2.8400, End Excluding 15.2.8441 | Start Including 15.3.8500, End Excluding 15.3.8531 | Start Including 15.4.8600, End Excluding 15.4.8630)
- Fixed versions
- Progress Sitefinity (Fixed from 15.2.8441, 15.3.8531, 15.4.8630)
- Published
- 2 June 2026
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
Signal timeline
- CVE published
- Latest EPSS score: 0.3%
- Signal calculated at 13