CVE-2023-6872Public exploitNetwork attack vector

Private-browsing history disclosure via GNOME system logs

Published Dec 19, 2023 · Updated Feb 13, 2025

Information disclosure in Mozilla Firefox before 121 allows remote attackers to persist private-tab browsing history in GNOME system logs. Firefox's getWindowTitleForBrowser returned the page-derived content title for private windows, and GNOME included that window title in logged shell errors. Exposure requires Linux with GNOME, a private window, and access to local logs; leaked titles reveal visited-page context without altering browser data.

CVSS severity6.5
Medium
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Mozilla Firefox before 121 allows remote attackers to persist private-tab browsing history in GNOME system logs. Firefox's getWindowTitleForBrowser returned the page-derived content title for private windows, and GNOME included that window title in logged shell errors. Exposure requires Linux with GNOME, a private window, and access to local logs; leaked titles reveal visited-page context without altering browser data.

The record

CVE
CVE-2023-6872
Published
Dec 19, 2023
Updated
Feb 13, 2025
Vendor
Mozilla
Product
Firefox
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <121

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <121

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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