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CVE-2026-8955

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:01d51feae5d98fd48ffdcec3ab617c0cf168e76dcf2fafeb37a3f8939f3f3da4
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.11","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"151","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/cna/affected/0

{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.11","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"151","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.11","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"151","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/cna/affected/0
{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.11","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"151","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-269","description":"CWE-269 Improper Privilege Management","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

5 source assertions
{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2031064"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/cna/references/0
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-46/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/cna/references/1
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-48/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/cna/references/2
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-50/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/cna/references/3
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-51/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:08e147996140c9fd84f6c34404c388297649468d660cd177da197a8e38cc9503 · sha256:5c47079acf23309b… · /containers/cna/references/4

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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