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CVE Record

CVE-2026-1404: Ultimate Member <= 2.11.1 - Reflected Cross-Site Scripting via Filter Parameters

The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the filter parameters (e.g., 'filter_first_name') in all versions up to, and including, 2.11.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

MediumCVSS 6.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2026-1404 affects the WordPress Ultimate Member plugin through version 2.11.1. An attacker can craft a link that injects script into member-directory filter parameters. The script runs only if a user clicks or otherwise opens the crafted link. This is a phishing-assisted website risk, not a server takeover by itself.

Executive priority

Treat as a timely website hygiene fix. Prioritize public WordPress sites using Ultimate Member, particularly membership communities or sites with logged-in administrators frequently browsing member directories.

Technical view

The issue is reflected cross-site scripting, CWE-79, in Ultimate Member filter parameters such as filter_first_name. Insufficient input sanitization and output escaping allow unauthenticated injection that executes in a victim browser after user interaction. CVSS is 6.1, network exploitable, low complexity, no privileges required, user interaction required, changed scope.

Likely exposure

Public WordPress sites using Ultimate Member through 2.11.1 are exposed, especially pages with member directory or filtering features reachable by unauthenticated visitors.

Exploitation context

No source provided shows active exploitation, and it is not listed as KEV. Exploitation requires persuading a user to open a crafted link, which limits automation but fits phishing and account-session abuse scenarios.

Researcher notes

The provided references identify vulnerable filter parameters and a WordPress.org changeset. Evidence supports reflected XSS through 2.11.1, but the bundle does not provide proof of exploitation in the wild or a named fixed version.

Mitigation direction

  • Update Ultimate Member to a version newer than 2.11.1 or the vendor-fixed release.
  • Review the WordPress plugin changelog and vendor guidance for the exact fixed version.
  • Use a WAF or security plugin to reduce suspicious filter-parameter requests.
  • Warn administrators and users not to open unexpected member-directory links.

Validation and detection

  • Inventory WordPress sites for the Ultimate Member plugin and installed version.
  • Confirm whether any installation is version 2.11.1 or earlier.
  • Identify public pages using member directory filter parameters.
  • Review web logs for unusual requests containing filter_* parameters.
  • Verify remediation by confirming the updated plugin version is deployed.
Prepared
Confidence
high
Sources
6

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.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-1404 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
Medium
CVSS
6.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

1CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

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
6.1CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.1Medium
CVSS 3.1 vector shape for CVE-2026-1404Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
ultimatememberUltimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin0unaffected
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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