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Lightbox & Modal Popup WordPress Plugin FooBox unauthenticated stored XSS in image alt attributes

CVE-2026-120687EUVD-2026-125938

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

7.2HighCNA
Exploited
No known exploitation
Fix
No fix listed
Who is exposed
Not reported
Published
Last modified
Reference
Last checked
29/100 · provisional
None on Exploit-DB, Metasploit or GitHub

Summary

The Lightbox & Modal Popup WordPress Plugin – FooBox plugin contains a stored DOM-based cross-site scripting flaw in how it handles image alt attributes, which lets an attacker inject scripts into pages. An attacker can reach it remotely without logging in, and the injected scripts run in the browser of any user who opens the affected page.

Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.

Original description

The Lightbox & Modal Popup WordPress Plugin – FooBox plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'img alt attribute inside .wp-caption container' parameter in all versions up to, and including, 2.8.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable by Subscriber-level users when bbPress is installed, as its bbp_filter_kses filter chain permits img and pre tags while preserving numeric character references inside attribute values, allowing encoded payloads to bypass save-time sanitization and reach the vulnerable sink fully intact. Exploitation by attackers with subscriber-level access and above requires that bbPress 2.6.20 is installed, a public forum exists, and either the first topic has already been approved or subsequent topics clear moderation. On a default installation, where that is not configured, the vulnerability requires attackers with contributor-level access and above.

cve.now Index

29Pcve.now Index 29 of 100 · methodology v3 · provisional
  • Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
  • Exposure17/25No login or user action needed per the CVSS vector, reachable over the network without a login · Unknown: No advisory context yet
  • Reach?/20Unknown. No tracked technology or package matched
  • Severity7.2/10CVSS 7.2
  • No patch5/5No patch listed yet

What would change the score

  • Would score about 74 if added to CISA KEV
  • Would score about 69 if CISA's SSVC rates exploitation active
  • Would score about 34 if advisories confirm default setups are exposed

How the score works · Rankings

Check your systems with an agent

Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.

Check whether my systems are affected by CVE-2026-120687 (Lightbox & Modal Popup WordPress Plugin <= 2.8.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Image Alt Attribute in…), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-120687 (entry last updated 2026-11-14):
Affected:
- fooplugins Lightbox & Modal Popup WordPress Plugin – FooBox: through 2.8.7
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-120687 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-120687 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://www.wordfence.com/threat-intel/vulnerabilities/id/66b5a5a2-8f70-4a85-ad03-8bd159cafdf5?source=cve
- https://plugins.trac.wordpress.org/browser/foobox-image-lightbox/tags/2.8.7/free/js/foobox.free.min.js
- https://plugins.trac.wordpress.org/browser/foobox-image-lightbox/tags/2.8.7/free/includes/class-script-generator.php#L175
- https://plugins.trac.wordpress.org/changeset/3789888/foobox-image-lightbox
- https://plugins.trac.wordpress.org/changeset?reponame=&new=3789888%40foobox-image-lightbox%2Ftags%2F2.8.8&old=3741260%40foobox-image-lightbox%2Ftags%2F2.8.7
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-120687
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-120687"}.

Timeline

  1. CVE published
  2. First seen by cve.now

Affected versions

  • fooplugins Lightbox & Modal Popup WordPress Plugin – FooBox

    through 2.8.7

Evidence 7

Vendor advisory · 4

Establishes: Affected and fixed versions.

  1. Link
  2. Link
  3. Link
  4. Link

CVE record · 2

Establishes: The identifier and description.

  1. Record
  2. Record

Other links · 1

  1. Link

Corrections

None so far.

Something wrong on this page? Report an error. Every fix is listed here.

Questions about CVE-2026-120687

Is CVE-2026-120687 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data

Which versions are affected by CVE-2026-120687?

Lightbox & Modal Popup WordPress Plugin – FooBox: through 2.8.7.Source: cve.now feed data

Sources

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