CVE-2023-4583

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2023-09-11. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

When checking if the Browsing Context had been discarded in HttpBaseChannel, if the load group was not available then it was assumed to have already been discarded which was not always the case for private channels after the private session had ended. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
48.3%
KEV
Not listed

Published

September 11, 2023

Last Modified

June 17, 2026

References (8)

Patch Availability(17)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-mozsymbols (117.0+build2-0ubuntu0.20.04.1) @ focal2026-05-24ubuntu
ubuntuxul-ext-lightning (1:115.3.1+build1-0ubuntu0.23.04.1) @ lunar2026-05-24ubuntu
redhatfirefox-0:102.15.0-1.el7_92023-09-07redhat
redhatthunderbird-0:102.15.0-1.el7_92023-09-04redhat
redhatthunderbird-0:102.15.0-1.el8_12023-09-04redhat
redhatfirefox-0:102.15.0-1.el8_22023-09-04redhat
redhatfirefox-0:102.15.0-1.el9_02023-09-04redhat
redhatthunderbird-0:102.15.0-1.el8_42023-09-04redhat
redhatthunderbird-0:102.15.0-1.el9_22023-09-04redhat
redhatthunderbird-0:102.15.0-1.el9_02023-09-04redhat
redhatfirefox-0:102.15.0-1.el8_82023-09-04redhat
redhatthunderbird-0:102.15.0-1.el8_82023-09-04redhat
redhatfirefox-0:102.15.0-1.el8_62023-09-04redhat
redhatfirefox-0:102.15.0-1.el9_22023-09-04redhat
redhatfirefox-0:102.15.0-1.el8_12023-09-04redhat
redhatfirefox-0:102.15.0-1.el8_42023-09-04redhat
redhatthunderbird-0:102.15.0-1.el8_22023-09-04redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(17)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-07-23 02:27 UTCEG score recompute
  2. 2026-07-22 23:14 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-4583?
CVE-2023-4583 is a high vulnerability published on September 11, 2023. When checking if the Browsing Context had been discarded in HttpBaseChannel, if the load group was not available then it was assumed to have already been discarded which was not always the case for private channels after the private session had ended. This vulnerability affects Firefox < 117,…
When was CVE-2023-4583 disclosed?
CVE-2023-4583 was first published in the National Vulnerability Database on September 11, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-4583 actively exploited?
CVE-2023-4583 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-4583?
CVE-2023-4583 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-4583?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-4583, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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