Security readout for executives and security teams
Plain-English summary
A flaw in reported UNA CMS versions 9.0.0-RC1 through 14.0.0-RC4 may let an unauthenticated internet attacker take control of the website server. Successful abuse could expose data, alter content, disrupt service, or execute attacker-supplied PHP code. Public exploit material is referenced, but the supplied sources do not establish active exploitation.
Executive priority
Treat this as an urgent, same-day exposure assessment for internet-facing UNA CMS systems. Isolate or restrict potentially affected instances while technical teams confirm versions and obtain authoritative vendor remediation. Escalate immediately if unexpected PHP files, application changes, or suspicious requests are found.
Technical view
The affected BxBaseMenuSetAclLevel.php component reportedly passes the profile_id POST parameter to PHP unserialize() without safe handling. This creates CWE-502 PHP object injection. The CVSS 4.0 score is 9.3: network-accessible, low complexity, no privileges, and no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Internet-accessible UNA CMS deployments within the reported 9.0.0-RC1 through 14.0.0-RC4 range are the primary concern. Exposure depends on the vulnerable component and endpoint being present and reachable. The bundle’s structured affected entry lists only 9.0.0-RC1, conflicting with the broader description, so administrators should verify exact applicability with UNA guidance.
Exploitation context
An Exploit Database entry and public security advisories exist, increasing the likelihood of attacker awareness. However, the supplied bundle marks KEV false and provides no evidence of observed exploitation in the wild. Public exploit availability should not be interpreted as confirmed active exploitation or universal exploitability across every deployment.
Researcher notes
The vulnerability is described as unsafe deserialization of attacker-controlled POST data, potentially reaching arbitrary PHP code execution through available object chains. The bundle does not identify required gadget chains, affected configurations, a fixing version, or a vendor mitigation. It also contains an affected-version inconsistency that requires vendor confirmation. Avoid assuming every installation in the narrative range is exploitable.
Mitigation direction
- Identify all UNA CMS deployments and record their exact versions and internet accessibility.
- Check current UNA CMS guidance for a patched release or vendor-approved mitigation.
- Prioritize restricting public access to affected installations until authoritative remediation is applied.
- Preserve application, web-server, authentication, and file-change logs before remediation.
- Review servers for unexpected PHP files, modified application files, or unauthorized administrative changes.
Validation and detection
- Confirm the deployed UNA CMS version using trusted package, source, or release metadata.
- Determine whether BxBaseMenuSetAclLevel.php and its associated request path are deployed and externally reachable.
- Verify remediation against current UNA release notes or security guidance.
- Inspect historical requests for unusual profile_id POST data without replaying exploit content.
- Compare application files against a trusted release and investigate unexplained PHP additions or modifications.
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-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. 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 lookupCVE-2025-66571 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
- 9.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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
1 official scoreWe 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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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
- ExploitDB-52139CVE reference, VulnCheck · exploit
- UNA CMS HomepageCVE reference, VulnCheck · product
- UNA CMS GitHub RepositoryCVE reference, VulnCheck · product
- Karma Security AdvisoryCVE reference, VulnCheck · vdb-entry
- https://www.vulncheck.com/advisories/una-cms-900-rc1-1400-rc4-php-object-injectionCVE 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.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.