Security readout for executives and security teams
Plain-English summary
CVE-2026-27174 is a critical MajorDoMo flaw that can let an unauthenticated internet user run PHP code through the admin console path. Successful abuse could fully compromise the application host. The source bundle does not prove active exploitation, but the impact and low attack complexity make exposed instances urgent.
Executive priority
Treat internet-exposed MajorDoMo as an immediate remediation item. The flaw is unauthenticated RCE with full confidentiality, integrity, and availability impact, but evidence of active exploitation was not provided in the bundle.
Technical view
The reported bug chains an admin redirect that continues execution with an unauthenticated AJAX console handler. User-controlled request data is passed to PHP eval() through register_globals behavior, resulting in unauthenticated remote code execution. The bundle lists CWE-94 and CVSS 9.8.
Likely exposure
Highest exposure is any MajorDoMo admin interface reachable from untrusted networks. Version scoping is incomplete: the bundle lists affected version "0" with default status unknown, so inventory must verify deployed MajorDoMo code against vendor guidance.
Exploitation context
The bundle says exploitation requires only network access, no credentials, and no user interaction. It is not marked KEV, and the supplied sources do not state active exploitation. Public advisories and a GitHub fix PR indicate public technical awareness.
Researcher notes
Key uncertainty is affected-version precision. The root cause described is missing termination after redirect plus unauthenticated access to an eval-backed console handler. Avoid assuming all versions or a specific fixed release unless confirmed by vendor artifacts.
Mitigation direction
- Identify all MajorDoMo deployments and admin interface exposure.
- Check vendor guidance and the referenced fix PR for applicable remediation.
- Apply a released version or patch that includes the fix, if available.
- Restrict admin access to trusted networks until remediation is confirmed.
- Review host integrity if the admin interface was internet exposed.
Validation and detection
- Confirm whether MajorDoMo is installed and reachable on public or partner-facing networks.
- Determine whether the deployed code includes the referenced authentication and execution-flow fix.
- Review access logs for unauthenticated admin AJAX console requests.
- Validate that unauthenticated users cannot reach console execution functionality.
- Document version, patch source, and residual exposure assumptions.
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-2026-27174 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
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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.
SSVC decision data
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:N/UI:N/S:U/C:H/I:H/A:H3.95.9VulnCheckCVSS: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
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/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.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- MajorDoMo Revisited: What I Missed in 2023CVE reference, VulnCheck · third-party-advisory
- Fix PR: sergejey/majordomo#1177CVE reference, VulnCheck · issue-tracking
- VulnCheck Advisory: MajorDoMo Unauthenticated Remote Code Execution via Admin Console EvalCVE 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.
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.