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CVE Record

CVE-2026-1302: Meta-box GalleryMeta <= 3.0.1 - Authenticated (Editor+) Stored Cross-Site Scripting via Image Caption

The Meta-box GalleryMeta 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 editor-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-2026-1302 is a stored cross-site scripting issue in the WordPress Meta-box GalleryMeta plugin through 3.0.1. An authenticated Editor or higher could save malicious script in image caption/gallery-related content that later runs for viewers. The impact is limited by required privileges and specific WordPress configurations.

Executive priority

Treat as a targeted WordPress hygiene issue, not an emergency. Remediate on sites with the plugin, especially multisite or delegated-editor environments, because stored XSS can affect administrators or visitors after malicious content is saved.

Technical view

The vulnerability is CWE-79 caused by insufficient input sanitization and output escaping in Meta-box GalleryMeta. Sources cite image caption/admin settings handling and template output paths in version 3.0.1. CVSS is 4.4, with high privileges and high attack complexity, changed scope, and low confidentiality/integrity impact.

Likely exposure

Exposure is likely limited to WordPress sites using Meta-box GalleryMeta version 3.0.1 or earlier, especially multisite deployments or sites where unfiltered_html is disabled. Attackers need Editor-level access or higher, reducing broad internet-facing risk.

Exploitation context

No CISA KEV listing or provided source indicates active exploitation. Abuse requires authenticated content-editing privileges and a vulnerable configuration. Successful exploitation could run script in another user's browser when they access affected gallery content.

Researcher notes

The public record describes stored XSS via image caption/admin settings with Editor+ access. The source bundle includes code locations and a WordPress.org changeset, but does not provide a clear fixed version string. Avoid assuming active exploitation or broader plugin impact beyond the stated configurations.

Mitigation direction

  • Inventory WordPress sites for Meta-box GalleryMeta and installed version.
  • Prioritize multisite installations and sites with unfiltered_html disabled.
  • Review vendor or WordPress plugin guidance for a fixed release tied to changeset 3446962.
  • Restrict Editor-level access to trusted users until remediated.
  • Remove or disable the plugin if it is unnecessary.

Validation and detection

  • Confirm whether Meta-box GalleryMeta is installed and active.
  • Check whether the installed version is 3.0.1 or earlier.
  • Identify whether the site is multisite or has unfiltered_html disabled.
  • Review recent gallery captions or related settings for unexpected script content.
  • Verify deployed plugin code includes the sanitization or escaping changes from changeset 3446962.
Prepared
Confidence
high
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-2026-1302 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
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
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-2026-1302Attack 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
shahinurislamMeta-box GalleryMeta0unaffected
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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