# CVE-2026-109973: Flipbox <= 3.1.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'flip-box-image-upload-url-01-alt' Parameter

Status: published. Published: 2026-11-07. Updated: 2026-11-07.

The Image Hover Effects Ultimate Visual Composer (Flipbox - Awesomes Flip Boxes Image Overlay) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'flip-box-image-upload-url-01-alt' parameter in versions up to, and including, 3.1.1. This is due to the plugin saving the image-alt field through sanitize_text_field() in Inc/Style22::register_child() (and Inc/Style18, 19, 20, 25, 29) — which preserves the double-quote character — and then concatenating the stored value into a double-quoted HTML attribute in Public_Render/Style22::default_render() (and the corresponding Style18/19/20/25/29 renderers) with no esc_attr() escaping. This makes it possible for authenticated attackers, with contributor-level access and above (when an administrator has delegated the plugin's 'Who can edit' capability via the plugin Settings page, or on multisite installations where even administrators lack unfiltered_html), to inject arbitrary web scripts in pages that will execute whenever a user accesses any page containing an affected [oxilab_flip_box] shortcode or block.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- oxilab / Flipbox – Awesomes Flip Boxes Image Overlay: ≥ 0; ≤ 3.1.1 (affected, semver). Source: CNA: Wordfence

## Severity and prioritization

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N; source: CNA: Wordfence

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/c3403cd6-31ba-4c36-a60e-d3e5c038af78?source=cve (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/image-hover-effects-ultimate-visual-composer/tags/3.1.0/Public_Render/Style22.php#L58 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/image-hover-effects-ultimate-visual-composer/tags/3.1.0/Inc/Style22.php#L169 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/image-hover-effects-ultimate-visual-composer/tags/3.1.0/Page/Admin_Render.php#L128 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/image-hover-effects-ultimate-visual-composer/tags/3.1.0/Includes/Admin/Menu.php#L53 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/changeset?reponame=&old=3762680%40image-hover-effects-ultimate-visual-composer&new=3762680%40image-hover-effects-ultimate-visual-composer (CNA: Wordfence)

## Provenance

- CNA: Wordfence: https://www.cve.org/CVERecord?id=CVE-2026-109973; retrieved 2026-11-07; source updated 2026-11-07

Revision: c8498f06a39cf4fe35f54efa13fe4c53a7db848011d802b1edc55ac8c44fa60c

Canonical: https://y2.dev/cve/CVE-2026-109973

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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