CVE Explorer

CVE-2026-41431

Zen is a firefox-based browser. Prior to 1.19.9b, Zen Browser ships a Mozilla Application Resource (MAR) updater (org.mozilla.updater) that has had all MAR signature verification stripped from the Firefox codebase it was forked from. The MAR files served to users contain zero cryptographic signatures, and the updater binary contains zero cryptographic verification code. This eliminates the defense-in-depth that MAR signing provides. If the update server or GitHub release pipeline is compromised,

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e6e96be27c611155c9dc751da989ea8b8c625c934d0af1ac4f0fdc797d4d3cc9

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"desktop","vendor":"zen-browser","versions":[{"status":"affected","version":"< 1.19.9b"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:002fa3b9b6546fd5bbe718c1e02d4f471c009f5fda5b86f9c6d3f1df3cc42001 · sha256:22ecd367f7bba71b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:002fa3b9b6546fd5bbe718c1e02d4f471c009f5fda5b86f9c6d3f1df3cc42001 · sha256:22ecd367f7bba71b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:002fa3b9b6546fd5bbe718c1e02d4f471c009f5fda5b86f9c6d3f1df3cc42001 · sha256:22ecd367f7bba71b… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/zen-browser/desktop/commit/270db6d6713d2c6c14d9df0b4bc7662843d3d54e","tags":["x_refsource_MISC"],"url":"https://github.com/zen-browser/desktop/commit/270db6d6713d2c6c14d9df0b4bc7662843d3d54e"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:002fa3b9b6546fd5bbe718c1e02d4f471c009f5fda5b86f9c6d3f1df3cc42001 · sha256:22ecd367f7bba71b… · /containers/cna/references/1

{"name":"https://github.com/zen-browser/desktop/security/advisories/GHSA-qpj9-m8jc-mw6q","tags":["x_refsource_CONFIRM"],"url":"https://github.com/zen-browser/desktop/security/advisories/GHSA-qpj9-m8jc-mw6q"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:002fa3b9b6546fd5bbe718c1e02d4f471c009f5fda5b86f9c6d3f1df3cc42001 · sha256:22ecd367f7bba71b… · /containers/cna/references/0

{"tags":["exploit"],"url":"https://github.com/zen-browser/desktop/security/advisories/GHSA-qpj9-m8jc-mw6q"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:002fa3b9b6546fd5bbe718c1e02d4f471c009f5fda5b86f9c6d3f1df3cc42001 · sha256:22ecd367f7bba71b… · /containers/adp/0/references/0

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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