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CVE Record

CVE-2026-1266: Postalicious <= 3.0.1 - Authenticated (Administrator+) Stored Cross-Site Scripting via Plugin Settings

The Postalicious plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 3.0.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

MediumCVSS 4.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2026-1266 affects the Postalicious WordPress plugin through version 3.0.1. A logged-in administrator could save malicious script in plugin settings, causing it to run when the affected page is viewed. Business risk is limited by the need for administrator access and specific WordPress configurations, but it can still impact site integrity and user trust.

Executive priority

Treat as a targeted hygiene issue, not an emergency. Prioritize sites using Postalicious in multisite or restricted-HTML configurations, especially where many administrators exist. Remediate during the next plugin maintenance cycle unless suspicious admin activity is observed.

Technical view

The issue is stored cross-site scripting caused by insufficient sanitization and output escaping in Postalicious admin settings. Sources state it affects multisite installations and installations where unfiltered_html is disabled. CVSS is 4.4 with high privileges and high attack complexity. The provided source metadata is inconsistent on affected versions, so confirm against vendor or Wordfence records.

Likely exposure

Exposure is most likely on WordPress sites running Postalicious up to and including 3.0.1, especially multisite deployments or environments with unfiltered_html disabled. Single-site installations with default administrator unfiltered HTML behavior may be less exposed based on the CVE description.

Exploitation context

No active exploitation is indicated in the provided sources, and the CVE is not listed as KEV. Exploitation requires an authenticated administrator-level user or higher. This is mainly relevant to compromised admin accounts, malicious insiders, or delegated administrators in multisite environments.

Researcher notes

The CVE description and Wordfence entry identify stored XSS in admin settings. WordPress Trac references point to relevant Postalicious code locations. The affected product metadata in the bundle appears incomplete or inconsistent, so rely on the narrative description and external advisory confirmation for scoping.

Mitigation direction

  • Inventory WordPress sites for Postalicious and installed version.
  • Review vendor and Wordfence guidance for an official fixed version.
  • Disable or remove Postalicious where it is not required.
  • Limit administrator access to trusted users only.
  • Harden administrator accounts with MFA and credential monitoring.
  • Review multisite administrator delegation and unfiltered_html policy.

Validation and detection

  • Confirm whether Postalicious is installed on each WordPress site.
  • Record plugin version and compare with 3.0.1 or earlier.
  • Identify whether the WordPress instance is multisite.
  • Check whether unfiltered_html is disabled for relevant administrators.
  • Review Postalicious settings for unexpected script-like content.
  • Monitor admin activity around plugin settings changes.
Prepared
Confidence
medium
Sources
7

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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cve · low confidence lookup

CVE-2026-1266 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
4.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:H/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.

1CVSS vectors
0Timeline events
0ADP providers
4Source 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
4.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N1.32.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.4Medium
CVSS 3.1 vector shape for CVE-2026-1266Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/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
neopPostalicious0unaffected
Weakness

CWE details

CWE-79

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