Security readout for executives and security teams
Plain-English summary
CVE-2018-8815 is a cross-site scripting issue in Alkacon OpenCMS 10.5.3. The reported vector is a malicious SVG image handled by the gallery function, which could cause script or HTML to run in a user’s browser. Business risk depends on whether OpenCMS gallery uploads or content management are exposed to untrusted users.
Executive priority
Prioritize if OpenCMS 10.5.3 is internet-facing or accepts content from external users. Otherwise, handle as a targeted CMS hygiene issue with confirmation of vendor remediation.
Technical view
The CVE describes XSS in the OpenCMS 10.5.3 gallery function via a malicious SVG image. Public references include the OpenCMS GitHub issue and an Exploit-DB entry. The source bundle does not provide CVSS, CWE, fixed-version details, or an affected-version range beyond 10.5.3.
Likely exposure
Exposure is likely limited to organizations running Alkacon OpenCMS 10.5.3 with gallery functionality and SVG upload or rendering paths reachable by untrusted or compromised users.
Exploitation context
The bundle includes a public Exploit-DB reference, so public exploit information exists. It does not show CISA KEV listing or confirmed active exploitation. Treat internet-facing CMS authoring surfaces as higher priority.
Researcher notes
Evidence is sparse. The CVE text names OpenCMS 10.5.3 and the gallery SVG vector, but the bundle lacks CVSS, CWE, patch details, and affected-range metadata. Avoid assuming broader versions without vendor confirmation.
Mitigation direction
- Check Alkacon/OpenCMS guidance for the issue and any fixed release notes.
- Inventory OpenCMS deployments and confirm whether version 10.5.3 is present.
- Restrict untrusted SVG uploads or gallery access until vendor guidance is confirmed.
- Review CMS authoring permissions for least-privilege access.
- Use browser-side controls such as CSP as defense in depth where feasible.
Validation and detection
- Confirm deployed OpenCMS version numbers from asset inventory or administration records.
- Identify whether gallery functionality accepts or renders SVG images.
- Review upload permissions for anonymous, external, or low-trust users.
- Check web logs for unusual SVG uploads around CMS gallery paths.
- Verify remediation against vendor documentation, not only local configuration changes.
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.
CVE-2018-8815 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/alkacon/opencms-core/issues/587CVE reference · x_refsource_MISC
- 44392CVE reference · exploit, x_refsource_EXPLOIT-DB
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.