ANALYSIS · 9da6cd21· FINISHED 2026-05-06 · PATCHDIFF

Folder Analysiscache/gutenverse_3.5.3 → cache/gutenverse_3.6.0✓ COMPLETED

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Vulnerable39

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1 CVE article ready PatchLeaks generated full security writeups for the matched CVEs · one per CVE, with affected files linked

CVE-2026-2868

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includes/block/class-accordion.php

AI: 2 vulnerabilities

CVE-2026-2868

#%!d(float64=002)

includes/block/class-divider.php

AI: 2 vulnerabilities

CVE-2026-2868

#%!d(float64=012)

includes/block/class-feature-list.php

AI: 1 vulnerabilities

CVE-2026-2868

#%!d(float64=013)

includes/block/class-gallery.php

AI: 1 vulnerabilities

CVE-2026-2868

#%!d(float64=015)

includes/block/class-icon-list-item.php

AI: 2 vulnerabilities

CVE-2026-2868

#%!d(float64=019)

includes/block/class-icon.php

AI: 2 vulnerabilities

CVE-2026-2868

#%!d(float64=021)

includes/block/class-image-box.php

No vulnerability

CVE-2026-2868

#%!d(float64=022)

includes/block/class-search.php

AI: 1 vulnerabilities

CVE-2026-2868

#%!d(float64=041)

lib/framework/includes/block/class-section.php

AI: 4 vulnerabilities

CVE-2026-2868

#%!d(float64=066)

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CVES 1

CVE-2026-2868

Security writeup for CVE-2026-2868

✓ 9 FILES

## The Exploit

Requires an authenticated contributor-level user or above to store a malicious `separatorIconSVG` block attribute.

```bash
# store the malicious separatorIconSVG payload in a Gutenberg block
curl -sk -X POST "https://target.example/wp-json/wp/v2/posts" \
  -H "Content-Type: application/json" \
  -H "Cookie: wordpress_logged_in_abcdef123456=USERSESSION" \
  -d '{"title":"XSS test","status":"publish","content":""}'

# trigger the stored payload by loading the rendered page
curl -sk "https://target.example/?p=123" | grep -o 'onload=alert(1)'
```

The first request stores a `gutenverse/section` block with a crafted `separatorIconSVG` attribute. The second request fetches the rendered page and shows the injected `onload=alert(1)` attribute inside the SVG `<path>` element, meaning the payload survives storage and is reflected in page HTML.

## What the Patch Did

Before:
```php
$svg  = '<svg class="guten-shape-fill" viewBox="' . esc_attr( $viewbox ) . '" preserveAspectRatio="none" fill="none" height="' . esc_attr( $height ) . '" width="' . esc_attr( $width ) . '" xmlns="http://www.w3.org/2000/svg">';
$svg .= '<path d="' . $d . '" fill="' . esc_attr( $fill ) . '"/>';
```

After:
```php
$svg  = '<svg class="guten-shape-fill" viewBox="' . esc_attr( $viewbox ) . '" preserveAspectRatio="none" fill="none" height="' . esc_attr( $height ) . '" width="' . esc_attr( $width ) . '" xmlns="http://www.w3.org/2000/svg">';
$svg .= '<path d="' . esc_attr( $d ) . '" fill="' . esc_attr( $fill ) . '"/>';
```

The patch adds `esc_attr()` output escaping around the SVG path data variable `$d` before it is injected into the HTML attribute context.

## Root Cause

This is CWE-79: stored cross-site scripting. An attacker-controlled `separatorIconSVG` value enters the page as a block attribute in the Gutenverse section block, is preserved in post content, and later reaches the SVG render sink in `class-section.php` where it is concatenated into `<path d="...">` without escaping. The code assumes the SVG path data is safe, so it crosses the HTML attribute boundary unchecked and allows quote-breaking injection.

## Why It Works

The single load-bearing fix is `esc_attr( $d )`. Without that line, the raw `separatorIconSVG` string can close the `d="..."` attribute and add new attributes like `onload`, making the XSS exploitable. The other `esc_attr()` calls on attributes like `viewBox`, `height`, `width`, and `fill` are consistent hardening for the surrounding SVG markup, but the payload only succeeds because `$d` was left unescaped.

## Hardening Checklist

- Escape all values rendered into HTML attributes with `esc_attr()` in block render callbacks.
- Sanitize block attributes on save or registration using `sanitize_text_field()` or a custom validator before storing them.
- When rendering user-provided SVG, apply `wp_kses_post()` or a strict SVG whitelist before outputting markup.
- Treat block attribute JSON as untrusted input and do not rely on editor-side encoding alone.
- Audit every SVG rendering path for mixed string concatenation into `d`, `path`, or `svg` attribute contexts.

## References

- https://nvd.nist.gov/vuln/detail/CVE-2026-2868

CVE CVE-2026-2868

PRODUCT Folder Analysis

AFFECTED ≤ cache/gutenverse_3.5.3

FIXED IN cache/gutenverse_3.6.0

STATUS Generated

Security writeup · CVE-2026-2868

Source files · 9

includes/block/class-accordion.php Linked

includes/block/class-divider.php Linked

includes/block/class-feature-list.php Linked

includes/block/class-gallery.php Linked

includes/block/class-icon-list-item.php Linked

includes/block/class-icon.php Linked

includes/block/class-image-box.php Linked

includes/block/class-search.php Linked

lib/framework/includes/block/class-section.php Linked

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