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CVE-2026-16377

Mitigation bypass in the PDF Viewer component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d12d0a0b12df4b3ae6ae45a8b440fcdbf9416ff7726a2af0dc96fee7ef2f1216
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":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.13","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"153","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/cna/affected/1

{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.13","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"153","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.13","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"153","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/cna/affected/1
{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.13","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"153","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-693","description":"CWE-693 Protection Mechanism Failure","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

5 source assertions
{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2037770"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/cna/references/0
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-68/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/cna/references/1
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-70/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/cna/references/2
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-71/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /containers/cna/references/3
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-72/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c812ea134459bb5554056ca6063e78b2f3fd095b7b4dc2446f81b8579ef210be · sha256:9d0a1d57d9d3bf35… · /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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