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CVE Record

CVE-2026-27178: MajorDoMo Stored Cross-Site Scripting via Method Parameters to Shoutbox

MajorDoMo (aka Major Domestic Module) contains a stored cross-site scripting (XSS) vulnerability through method parameter injection into the shoutbox. The /objects/?method= endpoint allows unauthenticated execution of stored methods with attacker-controlled parameters. Default methods such as ThisComputer.VolumeLevelChanged pass the user-supplied VALUE parameter directly into the say() function, which stores the message raw in the shouts database table without escaping. The shoutbox widget renders stored messages without sanitization in both PHP rendering code and HTML templates. Because the dashboard widget auto-refreshes every 3 seconds, the injected script executes automatically when any administrator loads the dashboard, enabling session hijack through cookie exfiltration.

HighCVSS 7.2Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

MajorDoMo can store attacker-supplied script in its shoutbox through an unauthenticated method endpoint. When an administrator opens the dashboard, the auto-refreshing widget can run that script, creating a realistic account/session compromise risk. The public sources do not show KEV listing or confirmed active exploitation.

Executive priority

Treat this as a high-priority administrative console risk for any exposed MajorDoMo deployment. It can convert a low-friction unauthenticated input path into script execution in an administrator browser, but public evidence does not establish active exploitation.

Technical view

The issue is stored XSS in MajorDoMo /objects/?method= handling. User-controlled parameters reach default methods such as ThisComputer.VolumeLevelChanged, then say(), then the shouts table without escaping. The shoutbox renders stored messages unsanitized in PHP/templates. CVSS is 7.2, CWE-79.

Likely exposure

Exposure is most likely where MajorDoMo is reachable by untrusted networks and the dashboard shoutbox widget is used. The source bundle lists vendor sergejey, product MajorDoMo, version "0" with unknown default status, so version impact remains incomplete.

Exploitation context

The source bundle describes unauthenticated injection and automatic execution when an administrator loads the dashboard. It also states possible session hijack through cookie exfiltration. However, KEV is false and no cited source confirms active exploitation in the wild.

Researcher notes

Key uncertainty is affected version scope: the bundle lists version "0" and unknown default status. Validate exact MajorDoMo build, shoutbox rendering path, and whether the GitHub PR is merged into the deployed release. Avoid assuming exploit activity without new evidence.

Mitigation direction

  • Check MajorDoMo vendor guidance and the referenced fix PR before deploying changes.
  • Upgrade to a vendor release that incorporates the shoutbox sanitization fix, if available.
  • Restrict MajorDoMo access to trusted networks or VPN-protected administrative paths.
  • Disable or remove the shoutbox widget if vendor remediation is unavailable.
  • Review stored shoutbox entries for suspicious markup or script content.

Validation and detection

  • Inventory MajorDoMo instances and confirm whether /objects/?method= is reachable by unauthenticated users.
  • Check whether dashboard shoutbox content renders stored messages without output encoding.
  • Compare local code against the referenced GitHub fix PR.
  • Confirm administrative access paths are not internet-exposed without additional controls.
  • Review logs and database shout entries for unexpected method-driven messages.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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.

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description · low confidence lookup

Database behavior lookup

The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-27178 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.2 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Official CVE source material

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.

2CVSS vectors
3Timeline events
1ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.2CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N3.92.7VulnCheck
5.3CVSS 4.0MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N——VulnCheck

Vulnerability scoring details

Base CVSS 4.0 score

5.3Medium
CVSS 4.0 vector shape for CVE-2026-27178Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
sergejeyMajorDoMo0unknown
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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