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Vulnerabilities

Vulnerability · CVE-2026-109936

Otter Blocks < 3.2.8 - Unauthenticated Stored XSS via Dynamic Content Render Filter

Published Oct 23, 2026 · catalog updated Nov 2, 2026 · Otter Blocks < 3.2.8

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Patch now

CVE-2026-109936 is in the CISA known-exploited catalog. Confirm Otter Blocks < 3.2.8 against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Otter Blocks < 3.2.8).
Severity
High7.5
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.28%
Remediation
Remediation guidance
Affected products
stated Otter Blocks · vendor Unknown Otter Blocks · vendor themeisle otter_blocks

The Otter Blocks WordPress plugin before 3.2.8 does not correctly bound a pattern it uses to rewrite its dynamic-content tokens while rendering blocks, so the pattern can consume the quote that closes an HTML attribute and pull adjacent unescaped data into the markup as new attributes. This allows unauthenticated users to achieve stored Cross-Site Scripting that executes in the browser of any visitor who views an affected page, including a logged-in administrator.

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.

  • stated Otter Blocks< 3.2.8
  • vendor Unknown Otter Blocksversion unspecified
  • vendor themeisle otter_blocksversion unspecified

How to fix CVE-2026-109936

What to do

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

Should you patch?

CVE-2026-109936 is in the CISA known-exploited catalog. Confirm Otter Blocks < 3.2.8 against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with Otter Blocks < 3.2.8. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 0.28%. The CISA KEV listing is the exploitation evidence. 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.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 23, 2026 · NIST NVD

    Detected

    The Otter Blocks WordPress plugin before 3.2.8 does not correctly bound a pattern it uses to rewrite its dynamic-content tokens while rendering blocks, so the pattern can consume the quote that closes an HTML attribute and pull adjacent unescaped data into the markup as new attributes. This allows unauthenticated users to achieve stored Cross-Site Scripting that executes in the browser of any visi

  2. Oct 23, 2026 · CVE.org

    Updated

    The Otter Blocks WordPress plugin before 3.2.8 does not correctly bound a pattern it uses to rewrite its dynamic-content tokens while rendering blocks, so the pattern can consume the quote that closes an HTML attribute and pull adjacent unescaped data into the markup as new attributes. This allows unauthenticated users to achieve stored Cross-Site Scripting that executes in the browser of any visi

  3. Nov 2, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  4. Nov 2, 2026 · VulnCheck KEV

    Updated

    The Otter Blocks WordPress plugin before 3.2.8 does not correctly bound a pattern it uses to rewrite its dynamic-content tokens while rendering blocks, so the pattern can consume the quote that closes an HTML attribute and pull adjacent unescaped data into the markup as new attributes. This allows unauthenticated users to achieve stored Cross-Site Scripting that executes in the browser of any visi

Sources

  • CVE.orgVulnerability recordCVE-2026-109936

    The Otter Blocks WordPress plugin before 3.2.8 does not correctly bound a pattern it uses to rewrite its dynamic-content tokens while rendering blocks, so the pattern can consume the quote that closes an HTML attribute and pull adjacent unescaped data into the markup as new attri

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-109936

    30-day exploitation probability 0.28%

    first.org
  • NIST NVDVulnerability recordCVE-2026-109936

    The Otter Blocks WordPress plugin before 3.2.8 does not correctly bound a pattern it uses to rewrite its dynamic-content tokens while rendering blocks, so the pattern can consume the quote that closes an HTML attribute and pull adjacent unescaped data into the markup as new attr

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-109936

    The Otter Blocks WordPress plugin before 3.2.8 does not correctly bound a pattern it uses to rewrite its dynamic-content tokens while rendering blocks, so the pattern can consume the quote that closes an HTML attribute and pull adjacent unescaped data into the markup as new attri

    vulncheck.com

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • VulnCheck KEVNov 6, 2026
  • CVE.orgOct 23, 2026
  • NIST NVDOct 23, 2026