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TI-2026-81724 Aliases CVE-2026-77871GHSA-6hh4-5cgj-w743

Stored cross-site scripting in Post Snippets WordPress plugin

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 Post Snippets WordPress plugin by saadiqbal is vulnerable to stored cross-site scripting via shortcode attributes in all versions up to and including 4.2.4. The plugin's shortcode filter converts entity-encoded payloads back into executable HTML at render time, after WordPress's wp_kses_post on-save sanitization has let them through (CWE-79). An authenticated attacker with contributor-level access or above can inject scripts that execute whenever a user accesses an injected page. The flaw requires snippet shortcodes to be enabled.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

The Post Snippets – Custom WordPress Code Snippets Customizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 4.2.4 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. Entity-encoded payloads such as <script>...</script> survive WordPress's wp_kses_post on-save sanitization because kses does not decode HTML entities, and are only converted back into executable HTML tags at render time by the plugin's own shortcode filter. This requires snippet shortcodes to be enabled.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00241 15th 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

VendorProductAffected versionsFixed inStatusSource
saadiqbalPost Snippets – Custom WordPress Code Snippets Customizerup to 4.2.4—No fix listedCNA
  • Post Snippets – Custom WordPress Code Snippets Customizer Vendorsaadiqbal Affected up to 4.2.4 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Post Snippets (Custom WordPress Code Snippets Customizer).

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-77871
  2. 2026-10-28 Alias added: GHSA-6hh4-5cgj-w743
  3. 2026-10-28 Priority changed: MEDIUM → LOW
  4. 2026-10-29 CISA SSVC decision points changed

References

Other 10

  • TI-2025-10849 Missing authorization in saadiqbal Post SMTP – Complete Email Deliverability and SMTP… CVSS 3.1CRITICAL 9.8
  • TI-2024-29006 WordPress myCred plugin <= 2.7.2 - PHP Object Injection vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2025-36263 WordPress All In One Login plugin <= 2.0.8 - Bypass Vulnerability vulnerability CVSS 3.1CRITICAL 9.1
  • TI-2026-05814 WPFormify <= 1.1.1 - Missing Authorization CVSS 3.1HIGH 8.2
  • TI-2025-42518 WordPress New User Approve plugin <= 3.2.0 - Broken Access Control vulnerability CVSS 3.1HIGH 8.6
  • TI-2024-35074 WordPress User Management plugin <= 1.1 - Arbitrary File Upload vulnerability CVSS 3.1CRITICAL 9.9
See all 77 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences