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Vulnerabilities

Vulnerability · CVE-2026-109780

Mitigation bypass in the DOM: Core & HTML component.

Published Oct 13, 2026 · catalog updated Oct 26, 2026 · Mitigation bypass in the

Last checked Oct 27, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-109780. EPSS is 0.36%. Act only if a listed version of Mitigation bypass in the is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Mitigation bypass in the).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.36%
Remediation
Advisory link
Affected products
vendor mozilla

Mitigation bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor mozillaversion unspecified

How to fix CVE-2026-109780

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-109780. EPSS is 0.36%. Act only if a listed version of Mitigation bypass in the is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.36%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 26, 2026 · BSI CERT-Bund

    Detected

    CVE-2026-109780 is listed by Mozilla Firefox und Thunderbrid: Mehrere Schwachstellen.

  2. Oct 26, 2026 · EUVD

    Updated

    Mitigation bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Sources

  • BSI CERT-BundGovernment advisoryCVE-2026-109780

    Mozilla Firefox und Thunderbrid: Mehrere Schwachstellen

    wid.cert-bund.de
  • CVE.orgVulnerability recordCVE-2026-109780

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-109780

    30-day exploitation probability 0.36%

    first.org
  • EUVDVulnerability recordEUVD-2026-98540

    Mitigation bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 27, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 27, 2026
  • EUVDOct 26, 2026
  • CVE.orgOct 26, 2026
  • BSI CERT-BundOct 26, 2026