CVE-2026-8622
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 · uneditedThe Image Sizes on Demand plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via PHP_SELF Server Variable in all versions up to, and including, 1.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. The injected payload only executes in the context of an administrator, as the settings page requires the manage_options capability to render.
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 · moderate confidenceThe Image Sizes on Demand WordPress plugin up to version 1.3 contains a reflected XSS vulnerability via the PHP_SELF server variable. The plugin fails to sanitize this input and escape output properly on its settings page, allowing unauthenticated attackers to inject malicious JavaScript through crafted URLs that execute when an administrator clicks the link.
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
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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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Verify Image Sizes on Demand plugin is installedCheck the WordPress plugins directory (wp-content/plugins/) for a folder named 'image-sizes-on-demand' or similar, or query the wp_options table for the plugin active option.Affected if The plugin folder exists or the plugin is listed in WordPress active plugins.
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Identify the installed plugin versionOpen the main plugin PHP file (typically image-sizes-on-demand.php) and locate the Version header in the plugin comment block, or check the readme.txt file for the 'Stable tag' entry.Affected if The version listed is 1.3 or lower (any version up to and including 1.3 is vulnerable).
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Confirm access to the plugin settings pageNavigate to the WordPress admin settings page for this plugin (usually under Settings > Image Sizes or similar) and inspect the page source for the form action attribute.Affected if The page loads and contains a form that uses PHP_SELF in its action (look for $_SERVER['PHP_SELF'] or similar server variable in the HTML source).
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Verify the XSS vulnerability existsView the page source of the plugin settings page and search for unfiltered PHP_SELF or REQUEST_URI being output directly in HTML attributes without sanitization.Affected if The PHP_SELF value appears in the HTML without proper escaping (htmlspecialchars, esc_attr, etc.).
If the plugin is installed with version 1.3 or lower and the settings page renders PHP_SELF without sanitization, the environment is affected by this reflected XSS vulnerability.
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.
dbcve · scopedUpdate to version 1.4 or later when available; in the interim, warn administrators against clicking untrusted links.
Latest version after 1.3 (check wordpress.org/plugins/image-sizes-on-demand for current stable release)
- Upgrade the Image Sizes on Demand plugin to the latest available version from the WordPress plugin repository
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-8622 — 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-2026-8622 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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- 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