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TI-2026-79561 Aliases CVE-2026-109933GHSA-655q-x6wx-x8mp

Stored cross-site scripting in Otter Blocks plugin via block styles

Priority LOW 30CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

The Otter Blocks WordPress plugin before 3.2.8 does not sanitize or escape user-supplied block styling values before writing them into an inline stylesheet, which is a cross-site scripting flaw (CWE-79). An authenticated user with contributor-level access or higher can inject scripts that run when any visitor, including administrators, views the affected post. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

The Otter Blocks WordPress plugin before 3.2.8 does not properly sanitize and escape user-supplied block styling values before writing them into an inline stylesheet, allowing users with contributor-level access and above to inject arbitrary web scripts that execute when any visitor, including administrators, views the affected post.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00306 23rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Otter Blocks (Unknown): 3.2.8

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
UnknownOtter Blocksbefore 3.2.83.2.8Patch availableCNA
  • Otter Blocks VendorUnknown Affected before 3.2.8 Fixed in 3.2.8 Patch available CNA

Remediation

Update Otter Blocks to version 3.2.8, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Otter Blocks (Unknown) Fixed in 3.2.8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Otter Blocks 3.2.8

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-79564 Stored cross-site scripting in Otter Blocks WordPress pluginPriority LOW 35
    • TI-2026-79563 Access control bypass in Otter Blocks exposes restricted block contentPriority LOW 30
    • TI-2026-79562 Otter Blocks exposes non-public content through REST APIPriority LOW 24
    Show all 4 records →

Timeline

  1. 2026-10-23 Threatist record created from CVE-2026-109933
  2. 2026-10-23 Alias added: GHSA-655q-x6wx-x8mp
  3. 2026-10-23 CVSS score added · CISA ADP
  4. 2026-10-23 Weakness changed · CISA ADP
  5. 2026-10-23 CISA SSVC decision points changed

References

Exploit 1

Sources

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