Security readout for executives and security teams
Plain-English summary
Redaxo CMS sites running the Mediapool addon 5.5.1 or older may let logged-in editor users upload executable files despite extension filtering. If abused, this can lead to full compromise of the web application and underlying data. Evidence does not show active exploitation, but a public exploit reference exists.
Executive priority
Prioritize remediation for any internet-facing Redaxo site with editor access enabled. The issue can move from a low-privilege account to code execution, so account compromise or weak editor governance materially raises business risk.
Technical view
The issue is an authenticated arbitrary file upload in Redaxo CMS Mediapool Addon 5.5.1 and older. The source bundle says blacklist-based extension restrictions can be bypassed with obfuscated PHP-style extensions, enabling arbitrary code execution. CVSS 3.1 is 8.8 with low complexity and low privileges required.
Likely exposure
Exposure is likely limited to Redaxo CMS deployments using Mediapool Addon 5.5.1 or older. Risk increases where editor accounts are broadly assigned, compromised, or accessible through internet-facing administration paths. The provided affected-version data is incomplete and should be verified against vendor records.
Exploitation context
The bundle cites an ExploitDB entry, so public exploit information exists. The CVE is not marked as CISA KEV, and the provided sources do not document active exploitation. Treat claims of in-the-wild exploitation as unconfirmed unless separate evidence is obtained.
Researcher notes
The sources identify the vulnerable component and bypass concept, but do not provide a confirmed fixed version in the bundle. Avoid assuming all Redaxo installations are affected; validate Mediapool addon version and deployment-specific upload execution behavior.
Mitigation direction
- Identify all Redaxo CMS instances and Mediapool addon versions.
- Check Redaxo or VulnCheck guidance for fixed versions or vendor mitigations.
- Restrict editor accounts to trusted users with current business need.
- Limit administrative and editor access behind VPN, SSO, or network controls.
- Prevent script execution from media upload directories where the platform supports it.
- Review uploaded media for suspicious executable or obfuscated extensions.
Validation and detection
- Confirm whether Mediapool Addon 5.5.1 or older is installed.
- Review editor-role accounts for unnecessary or stale access.
- Inspect media upload directories for executable file types or unusual extensions.
- Check web server configuration for script execution in upload paths.
- Review logs for suspicious authenticated uploads and subsequent script requests.
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-863: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-25353 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
CVSS vector scores
2 official scoresWe 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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-44891CVE reference, VulnCheck · exploit
- Official Product HomepageCVE reference, VulnCheck · product
- Product ReferenceCVE reference, VulnCheck · product
- VulnCheck Advisory: Redaxo CMS Mediapool Addon 5.5.1 Arbitrary File UploadCVE 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.
Incorrect Authorization
Incorrect Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.