CVE-2026-14833Public exploitNetwork attack vector

Stored XSS via decoded caption attribute

Published Jul 31, 2026 · Updated Jul 31, 2026

Stored XSS in Lightbox with PhotoSwipe before 5.9.0 allows remote authenticated users to run JavaScript when visitors open lightboxes. The plugin decodes HTML entities from the data-lbwps-caption link attribute and inserts the resulting markup into the PhotoSwipe caption without sanitization or output escaping. Author access is sufficient with default caption display; Contributor access also works when an Editor or Administrator previews the post, and execution occurs only after a visitor clicks the crafted lightbox link.

CVSS severity6.8
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Lightbox with PhotoSwipe before 5.9.0 allows remote authenticated users to run JavaScript when visitors open lightboxes. The plugin decodes HTML entities from the data-lbwps-caption link attribute and inserts the resulting markup into the PhotoSwipe caption without sanitization or output escaping. Author access is sufficient with default caption display; Contributor access also works when an Editor or Administrator previews the post, and execution occurs only after a visitor clicks the crafted lightbox link.

The record

CVE
CVE-2026-14833
Published
Jul 31, 2026
Updated
Jul 31, 2026
Vendor
Arno Welzel
Product
Lightbox with PhotoSwipe
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <5.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Arno Welzel · Lightbox with PhotoSwipeversion=0 <5.9.0

Published CVSS scores

6.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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