# CVE-2026-91049: EWWW Image Optimizer 8.7.4 - 8.9.0 - Author+ Stored XSS via 'data-script' Lazy Load Attribute

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

The EWWW Image Optimizer WordPress plugin before 8.9.1 does not properly sanitize and restrict a value in post content before using it to dynamically load and execute a script in the page, allowing authenticated attackers with author-level access and above to inject arbitrary web scripts that run in the session of any user who views the affected page, including administrators.

This is an incomplete fix of CVE-2026-15446: the origin and path restrictions added from 8.7.4 onward were each bypassable, so versions 8.7.4 through 8.9.0 remain affected.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Unknown / EWWW Image Optimizer: ≥ 8.7.4; < 8.9.1 (affected, semver). Source: CNA: WPScan

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79

## Exploit evidence

- exploit: https://wpscan.com/vulnerability/cdaf3779-3e8a-4997-9868-707bcc06f9a7/ (CNA: WPScan)

## References

- https://wpscan.com/vulnerability/cdaf3779-3e8a-4997-9868-707bcc06f9a7/ (CNA: WPScan; exploit, vdb-entry, technical-description)

## Provenance

- CNA: WPScan: https://www.cve.org/CVERecord?id=CVE-2026-91049; retrieved 2026-11-05; source updated 2026-11-05

Revision: 6bcf9c1fc595e76ca791c212837ec50a9fd5cc7c963a8c4a3bd8e7b32974bec5

Canonical: https://y2.dev/cve/CVE-2026-91049

## Agent and API access

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- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

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- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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