Canvas <= 2.5.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'tag' Block Attribute
Priority LOW 28CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The Canvas plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'tag' parameter in all versions up to, and including, 2.5.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00199 9th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| codesupplyco | Canvas | up to 2.5.2 | — | No fix listed | CNA |
- Canvas Vendorcodesupplyco Affected up to 2.5.2 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-9629
- 2026-10-03 Alias added: GHSA-v675-74rr-5jfh
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/f93d70e4-01c5-44e8-b7d5-0837bee53b8d?source=cve
- https://plugins.trac.wordpress.org/browser/canvas/tags/2.5.2/components/basic-elements/block-section-heading/render.php#L32
- https://plugins.trac.wordpress.org/browser/canvas/tags/2.5.2/components/basic-elements/block-section-heading/render.php#L13
- https://plugins.trac.wordpress.org/browser/canvas/tags/2.5.2/gutenberg/custom-blocks/index.php#L798
- https://plugins.trac.wordpress.org/changeset/3553553/canvas/trunk/components/basic-elements/block-section-heading/render.php
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fcanvas/tags/2.5.2&new_path=%2Fcanvas/tags/2.5.3
More codesupplyco vulnerabilities
- TI-2024-02769 Networker - Tech News WordPress Theme with Dark Mode <= 1.1.9 - Missing Authorization CVSS 3.1MEDIUM 5.3
- TI-2025-32773 WordPress Networker theme <= 1.2.0 - Local File Inclusion Vulnerability CVSS 3.1HIGH 8.1
- TI-2026-28533 WordPress Uppercase theme < 1.2.2 - Local File Inclusion vulnerability CVSS 3.1HIGH 8.1
- TI-2024-08378 Missing authorization in codesupplyco Sight – Professional Image Gallery and Portfolio CVSS 3.1MEDIUM 5.3
- TI-2026-22518 WordPress Powerkit plugin <= 3.1.0 - Cross Site Scripting (XSS) vulnerability CVSS 3.1MEDIUM 6.5
- TI-2026-13167 Powerkit <= 3.1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes CVSS 3.1MEDIUM 6.4
Sources
- CVE-2026-9629 · CVE Program
- CVE-2026-9629 · NVD
- FIRST EPSS
- GHSA-v675-74rr-5jfh · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences