Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.
CVE-2026-124905
UNRATEDCVSS · not yet scored
Also known asEUVD-2026-121092 (ENISA EUVD) · GHSA-cr6c-wf9f-5wq3 (GitHub Security Advisories)Source: ENISA EUVD
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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS v2: —Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS
- —
- EchelonGraph score
- Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
- EG Score
- —
- EG Risk
- —
- EPSS PROB
- 0.2%
- EPSS %ILE
- 8th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
- EG Severity
- Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
- EG Likelihood
- 0.2% 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
- No SSVC decision: EchelonGraph has not assessed this CVECISA BOD 26-04: 14 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 BOD 26-04 block below.
BOD 26-04 (CISA's remediation timeline, Table 1)14 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's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” 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 (6)
- security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=2086254
- security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-125/
- security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-126/
- 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-2026-124905(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-cr6c-wf9f-5wq3GitHub Security Advisoriesunknown
Sandbox escape in the DOM: Navigation 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) |
| — |
Data Freshness Timeline
(refreshed 13× in last 7d / 13× 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 → 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.
- 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-11-10 21:33 UTCGHSA enrichmentGHSA-cr6c-wf9f-5wq3
- 2026-11-10 21:27 UTCNVD update
- 2026-11-10 20:37 UTCGHSA enrichmentGHSA-cr6c-wf9f-5wq3
- 2026-11-10 20:29 UTCMITRE cvelistV5
- 2026-11-10 19:43 UTCGHSA enrichmentGHSA-cr6c-wf9f-5wq3
- 2026-11-10 16:49 UTCGHSA enrichmentGHSA-cr6c-wf9f-5wq3
- 2026-11-10 15:50 UTCGHSA enrichmentGHSA-cr6c-wf9f-5wq3
- 2026-11-10 14:27 UTCNVD update
- 2026-11-10 14:00 UTCENISA EUVD ID recordedEUVD-2026-121092 · Source: ENISA EUVD
- 2026-11-10 13:35 UTCEchelonGraph re-scored
- 2026-11-10 13:34 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-124905?
CVE-2026-124905 is a vulnerability whose severity is not yet rated; its CVE record was published on November 10, 2026. Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.
When was the CVE record for CVE-2026-124905 published?
The CVE record for CVE-2026-124905 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-2026-124905 actively exploited?
CVE-2026-124905 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-124905?
A fix for CVE-2026-124905 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-124905 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-2026-124905
Is Your Infrastructure Affected by CVE-2026-124905?
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