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Vulnerabilities

Vulnerability · CVE-2025-8607

The SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's Countdown block's attribute

Published Aug 21, 2025 · catalog updated Apr 8, 2026 · SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels)

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-8607. EPSS is 0.20%. Act only if a listed version of SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.20%
Remediation
Vendor / distro source
Affected products
vendor amans2k SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) 0 ≤1.6.0

The SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's Countdown block's attributes in all versions up to, and including, 1.6.0 due to insufficient input sanitization and output escaping on user supplied attributes. 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor amans2k SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) 0 ≤1.6.00 ≤1.6.0

How to fix CVE-2025-8607

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-8607. EPSS is 0.20%. Act only if a listed version of SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) is installed.

Which versions are affected?

Compare what you have installed with amans2k SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) 0 ≤1.6.0 0 ≤1.6.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.20%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 21, 2025 · EUVD

    Detected

    The SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's Countdown block's attributes in all versions up to, and including, 1.6.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and

  2. Apr 8, 2026 · EUVD

    Updated

    The SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's Countdown block's attributes in all versions up to, and including, 1.6.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and

Sources

  • CVE.orgVulnerability recordCVE-2025-8607

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-8607

    30-day exploitation probability 0.20%

    first.org
  • EUVDVulnerability recordEUVD-2025-25430

    The SlingBlocks – Gutenberg Blocks by FunnelKit (Formerly WooFunnels) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's Countdown block's attributes in all versions up to, and including, 1.6.0 due to insufficient input sanitization and output esca

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 21, 2026