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CVE Record

CVE-2026-1820: Media Library Alt Text Editor <= 1.0.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'post_id' Shortcode Attribute

The Media Library Alt Text Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'bvmalt_sc_div_update_alt_text' shortcode in all versions up to, and including, 1.0.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

MediumCVSS 6.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2026-1820 affects the WordPress Media Library Alt Text Editor plugin through version 1.0.0. A logged-in user with Contributor-level access or higher could store JavaScript in content through a shortcode attribute. That script may run when someone views the affected page, creating risk to site users and administrators.

Executive priority

Treat this as a moderate-priority WordPress plugin issue. It is not known to be actively exploited, but it can turn a low-privileged account into a vehicle for persistent browser-side attacks. Prioritize sites with many contributors or weak account governance.

Technical view

The issue is stored cross-site scripting in the plugin’s bvmalt_sc_div_update_alt_text shortcode, tied to insufficient sanitization and output escaping of user-supplied attributes, including post_id. It is classified as CWE-79 with CVSS 3.1 score 6.4. The attack requires authenticated low-privileged access and can impact confidentiality and integrity.

Likely exposure

Exposure is limited to WordPress sites running Media Library Alt Text Editor version 1.0.0 or earlier, especially where Contributor or higher accounts exist. Public source data does not confirm a patched version.

Exploitation context

The CVE is not listed as KEV, and the provided sources do not report active exploitation. Exploitation requires an authenticated account with Contributor-level privileges or higher, reducing exposure compared with unauthenticated web attacks.

Researcher notes

The public record identifies stored XSS through shortcode attribute handling and links to the plugin code location. The source bundle does not include a vendor advisory, patch commit, or fixed version. Avoid assuming remediation beyond vendor guidance, deactivation, removal, or access restriction.

Mitigation direction

  • Inventory WordPress sites for Media Library Alt Text Editor version 1.0.0 or earlier.
  • Check the plugin vendor or WordPress plugin page for updated guidance or releases.
  • Disable or remove the plugin if it is not business-critical.
  • Restrict Contributor and higher access to trusted users only.
  • Review existing content using the affected shortcode for suspicious script behavior.

Validation and detection

  • Confirm whether the plugin is installed and its version is 1.0.0 or earlier.
  • Identify users with Contributor, Author, Editor, or Administrator roles.
  • Search site content for the bvmalt_sc_div_update_alt_text shortcode.
  • Review recent posts or pages created by lower-privileged users.
  • Monitor security logs for unexpected script execution reports.
Prepared
Confidence
high
Sources
4

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-2026-1820 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/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
3Source 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
6.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.4Medium
CVSS 3.1 vector shape for CVE-2026-1820Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/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
brainvireinfoMedia Library Alt Text Editor0unaffected
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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