What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-06-02 · updated 2026-10-23

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.

Affected products

• Mozilla Firefox: before 109.0 — fixed in 109.0
• Mozilla Firefox ESR: before 102.7 — fixed in 102.7
• Mozilla Thunderbird: before 102.7 — fixed in 102.7

How to fix

Upgrade to a fixed version: Mozilla Firefox 109.0; Mozilla Firefox ESR 102.7; Mozilla Thunderbird 102.7. Check the vendor advisory for mitigations.

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/
• 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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