Information disclosure in the Address Bar component. This vulnerability was fixed in Firefox 160, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.
CVE-2026-124930
MEDIUMPre-NVD 4.34.3
EchelonGraph scoreHIGH confidence
“—” beside the score: it is equal to the CVSS score beside it.
Score 4.3 from GitHub Security Advisory (severity: MODERATE) published 2026-11-10. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 4.3; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, GitHub Security Advisory
Also known asEUVD-2026-120910 (ENISA EUVD) · GHSA-6828-pq45-w7rq (GitHub Security Advisories)Source: ENISA EUVD
4.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.3Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 4.3
- EG Score
- 4.3MEDIUMhigh confidence
- EG Risk
- 19EG Risk 19/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity43% × 45%Impact severity (EG Severity): CVSS 4.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0% × 40%No KEV listing, EG-KEV tier or EPSS when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.3%
- EPSS %ILE
- 22nd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (4.3): severity, escalated by confirmed exploitation. This CVE's 4.3 is its impact severity (EG Severity), not escalated.
- EG Severity
- 4.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.3% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
November 10, 2026
Last Modified
November 10, 2026
References (5)
- security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=2082172
- security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-125/
- security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-127/
- security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-128/
- security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-129/
Vendor Advisories for CVE-2026-124930(6)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:99572Red Hat Product SecurityHigh
Red Hat Security Advisory: firefox security update
- RHSA-2026:99571Red Hat Product SecurityHigh
Red Hat Security Advisory: firefox security update
- RHSA-2026:99112Red Hat Product SecurityHigh
Red Hat Security Advisory: firefox security update
- RHSA-2026:99110Red Hat Product SecurityHigh
Red Hat Security Advisory: firefox security update
- RHSA-2026:99111Red Hat Product SecurityHigh
Red Hat Security Advisory: firefox security update
- GHSA-6828-pq45-w7rqGitHub Security AdvisoriesMedium
Information disclosure in the Address Bar component. This vulnerability was fixed in Firefox 160...
Affected Packages
(3 across 3 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| firefox-esr | 102.11.0esr-1 ... 153.6.0esr-1~deb13u1 (220 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| firefox-esr | 128.13.0esr-1 ... 153.6.0esr-1~deb13u1 (95 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| firefox-esr | 128.13.0esr-1 ... 153.6.0esr-1~deb13u1 (95 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 11× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.
- 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-11-10 21:31 UTCGHSA enrichmentGHSA-6828-pq45-w7rq · GitHub severity MODERATE · GitHub CVSS 4.3
- 2026-11-10 20:35 UTCGHSA enrichmentGHSA-6828-pq45-w7rq · GitHub severity MODERATE · GitHub CVSS 4.3
- 2026-11-10 19:38 UTCGHSA enrichmentGHSA-6828-pq45-w7rq · GitHub severity MODERATE · GitHub CVSS 4.3
- 2026-11-10 16:48 UTCGHSA enrichmentGHSA-6828-pq45-w7rq · GitHub severity MODERATE · GitHub CVSS 4.3
- 2026-11-10 15:48 UTCEchelonGraph re-scored
- 2026-11-10 15:48 UTCGHSA enrichmentGHSA-6828-pq45-w7rq · GitHub severity MODERATE · GitHub CVSS 4.3
- 2026-11-10 14:50 UTCEchelonGraph re-scoredFirst assessed: 4.3 MEDIUM
- 2026-11-10 14:49 UTCMITRE cvelistV5CVSS v3 → 4.3 · severity → MEDIUM
- 2026-11-10 14:27 UTCNVD update
- 2026-11-10 14:00 UTCENISA EUVD ID recordedEUVD-2026-120910 · Source: ENISA EUVD
- 2026-11-10 13:35 UTCEchelonGraph re-scored
- 2026-11-10 13:34 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-124930?
CVE-2026-124930 is a medium-severity vulnerability; its CVE record was published on November 10, 2026. Information disclosure in the Address Bar component. This vulnerability was fixed in Firefox 160, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.
When was the CVE record for CVE-2026-124930 published?
The CVE record for CVE-2026-124930 was published on November 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 10, 2026; the record at its source may have been updated since.
Is CVE-2026-124930 actively exploited?
CVE-2026-124930 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-124930?
CVE-2026-124930 has a CVSS v3.1 base score of 4.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-124930?
A fix for CVE-2026-124930 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-124930 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-124930
Is Your Infrastructure Affected by CVE-2026-124930?
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