CVE-2026-57755
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedContributor Cross Site Scripting (XSS) in Mosaic Gallery – Advanced Gallery <= 1.2.0 versions.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA Cross-Site Scripting (XSS) vulnerability exists in the Mosaic Gallery – Advanced Gallery WordPress plugin (versions <= 1.2.0). The flaw allows users with Contributor-level permissions to inject malicious JavaScript code through the gallery functionality, which then executes when other users view the affected gallery content.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm the Mosaic Gallery plugin is installedNavigate to WordPress admin > Plugins and look for 'Mosaic Gallery - Advanced Gallery' in the installed plugins list, or check the /wp-content/plugins/ directory for a folder named 'mosaic-gallery' or similar.Affected if The plugin appears in the installed plugins list.
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Identify the installed versionIn the WordPress Plugins admin page, find the version number displayed beneath the plugin name 'Mosaic Gallery - Advanced Gallery'. Alternatively, open the main plugin PHP file (typically at /wp-content/plugins/[plugin-folder]/mosaic-gallery.php) and look for the 'Version:' header comment.Affected if The displayed version is 1.2.0 or any version number lower than 1.2.0.
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Check if galleries are created and activeLook for any published posts or pages containing a gallery that uses this plugin. Check for the plugin's shortcode (commonly [mosaic_gallery] or similar) in post content by searching the wp_posts table or using a plugin manager. Also verify if any gallery post types exist in the WordPress admin under the plugin's menu.Affected if There is at least one gallery created or published using this plugin.
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Review user role permissionsIn WordPress admin, go to Users > Users List and verify which users have the 'Contributor' role assigned. The vulnerability is exploitable by users with Contributor-level permissions or higher.Affected if There are active user accounts assigned the Contributor role (or higher roles) who have access to create or edit gallery content.
You are affected if the Mosaic Gallery - Advanced Gallery plugin is installed at version 1.2.0 or lower AND there are galleries created with the plugin in use, particularly if you have users with Contributor-level access.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpdate the Mosaic Gallery – Advanced Gallery plugin to a version newer than 1.2.0. If no patched version is available, disable the plugin until a fix is released.
- Consultation1.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-57755 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-57755 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data