CVE-2023-5721

MEDIUM 4.3CVE-2023-5721 · Published 25/10/2023 · updated 17/06/2026

In short

CVE-2023-5721 is a MEDIUM (CVSS 4.3) vulnerability affecting firefox (mozilla), firefox esr (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.85%, higher than 58.4% of all vulnerabilities.
Fix: update to 119.0, 115.4, 115.4.1 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 119.0`	`119.0`
firefox esr mozilla	`< 115.4`	`115.4`
thunderbird mozilla	`< 115.4.1`	`115.4.1`

Description

It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally by the user due to an insufficient activation-delay. This vulnerability affects Firefox < 119, Firefox ESR < 115.4, and Thunderbird < 115.4.1.

References

bugzilla.mozilla.org/show_bug.cgi · Issue Tracking
lists.debian.org/debian-lts-announce/2023/10/msg00037.html · Mailing List
lists.debian.org/debian-lts-announce/2023/10/msg00042.html · Mailing List
debian.org/security/2023/dsa-5535 · Mailing List
debian.org/security/2023/dsa-5538 · Third Party Advisory
mozilla.org/security/advisories/mfsa2023-45 · Vendor Advisory
mozilla.org/security/advisories/mfsa2023-46 · Vendor Advisory
mozilla.org/security/advisories/mfsa2023-47 · Vendor Advisory

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Package

Affected versions

Patched versions

firefox

mozilla

< 119.0

119.0

firefox esr

mozilla

< 115.4

115.4

thunderbird

mozilla

< 115.4.1

115.4.1

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