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🛡️ CVE-2023-6872 on Ubuntu — firefox

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Browser tab titles were being leaked by GNOME to system logs. This could potentially expose the browsing habits of users running in a private tab. This vulnerability affects Firefox < 121.

Distribution advisory

This page covers CVE-2023-6872 as tracked by Ubuntu, for the package firefox. The fix is available in version 121.0+build1-0ubuntu0.20.04.1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: None.
  • Availability impact: None.

Affected software

UBUNTU-CVE-2023-6872 is recorded against 7 packages.

  • firefox (fixed in 121.0+build1-0ubuntu0.20.04.1)
  • mozjs102
  • mozjs38
  • mozjs52
  • mozjs68
  • mozjs78
  • mozjs91

Timeline and source

Published on 20 December 2023 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.mozilla.org (Report)
bugzilla.mozilla.org (Report)
www.mozilla.org (Report)
ubuntu.com (Advisory)
www.cve.org (Report)

Other advisories for this package

firefox has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-6872 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2023-12-20
Updated 2026-08-20
Modified 2026-04-22
Fix URL N/A

Affected Packages

Software From version Fixed in
firefox — 121.0+build1-0ubuntu0.20.04.1
mozjs102 — —
mozjs38 — —
mozjs52 — —
mozjs68 — —
mozjs78 — —
mozjs91 — —

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