Security readout for executives and security teams
Plain-English summary
CVE-2026-26682 is a high-severity arbitrary code execution issue in fastCMS before version 0.1.6. It requires local access and low privileges, so it is less exposed than a remote internet-facing flaw, but compromise could still allow full control over confidentiality, integrity, and availability of the affected system.
Executive priority
Prioritize inventory and remediation for systems with multiple local users, shared hosting, or sensitive data. The issue is high impact but local-access constrained, so urgency should be highest where untrusted or broadly privileged users can reach fastCMS hosts.
Technical view
The CVE describes CWE-94 code injection in fastCMS PluginController.java. CVSS 3.1 is 7.8 with AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The record lists fastCMS before v0.1.6, but vendor, CPE, and detailed affected-product metadata are not provided.
Likely exposure
Exposure is likely limited to environments running fastCMS versions before 0.1.6 where a local low-privileged user can access the affected application context. Asset discovery may be manual because the CVE record does not provide vendor or CPE identifiers.
Exploitation context
The CVE is not listed as KEV in the provided bundle. Public references include RCE-focused research links, but the bundle does not establish confirmed active exploitation in the wild. Treat the references as evidence that technical details may be publicly available.
Researcher notes
Key gaps remain: no vendor/CPE metadata, limited affected-version detail beyond “before v0.1.6,” and no confirmed exploitation signal. Analysis should focus on validating fastCMS presence, versioning, local privilege boundaries, and whether upstream guidance confirms 0.1.6 as the fixed release.
Mitigation direction
- Inventory fastCMS deployments and identify versions below 0.1.6.
- Review project or vendor guidance for confirmed remediation instructions.
- Upgrade to 0.1.6 or later if supported by official guidance.
- Restrict local shell and application access to trusted users.
- Limit plugin administration privileges to necessary personnel only.
- Monitor affected hosts for unexpected code or plugin changes.
Validation and detection
- Confirm whether fastCMS is installed on servers or developer workstations.
- Record the installed fastCMS version for each instance.
- Check whether PluginController.java exists in the deployed application.
- Review local user and service-account access to affected hosts.
- Verify remediation against official project guidance before closure.
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-94: 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 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 lookupCVE-2026-26682 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/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
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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/sorzs/test/tree/main/fastcms-rceCVE reference
- https://gist.github.com/sorzs/e3913b814e2e5548aa66de6c25b0510aCVE reference
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.
Improper Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.