CVE-2026-74959
Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, T
CVSS
9.1
Critical
EPSS
0.2%
p6
KEV
—
Exploit Today
2
0-100
Published: Aug 18, 2026 · Last modified: Aug 21, 2026 · CWE-693
0.2%EPSS · 30 days0.2%
2026-08-192026-08-20
Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=2047853
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-74/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-76/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-77/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-78/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-79/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-80/
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-54073——
———VeraCrypt provides disk encryption with strong security based on TrueCrypt. From 1.26.6 until 1.26.29, file-hosted hidden volume creation forces quick format and the FormatNoFs function in src/Common/Format.c and FormatFat function in src/Common/Fat.c use WriteFile to place raw zeroed sectors at predictable 128 MiB intervals. These writes bypass the normal EncryptDataUnits formatting path, leaving deterministic plaintext markers in an area expected to resemble random ciphertext. The markers can weaken plausible deniability during forensic inspection, although they do not disclose hidden-volume content or reduce the strength of VeraCrypt encryption. This issue is fixed in version 1.26.29.7hCVE-2026-768276.8 MED13.7%
——4A flaw was found in search-indexer. This vulnerability allows a registered and authenticated managed cluster to tamper with or delete another cluster's indexed search data. This is possible because the delta-sync write paths in search-indexer do not properly restrict UPDATE/DELETE operations to data owned by the calling cluster. An attacker could exploit this by crafting specific user identifiers (UIDs) with a different cluster's prefix.10hCVE-2026-528736.9 MED20.4%
——6Streambert is a cross-platform Electron Desktop App to stream and download video content. From version 2.5.0 until version 2.6.0, the wyzie-open-redeem IPC handler in index.js creates the partition:wyzie-redeem Electron session and registers an onHeadersReceived hook that removes the Content-Security-Policy header from every response in that session. The redeem window also lacks a setWindowOpenHandler restriction, so script injection in sub.wyzie.io, a loaded third-party resource, or a site reached through navigation executes without CSP constraints and can affect additional windows and persistent session storage. A user must open the Wyzie API key redemption window, and exploitation requires attacker-controlled script content in a loaded page. The resulting renderer script can invoke renderer-exposed application functionality and can be chained with other vulnerabilities to access internal services or sensitive data. This issue is fixed in version 2.6.0.7hCVE-2026-7587410.0 CRI33.7%
——10Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154 and Thunderbird 154.2dCVE-2026-749838.1 HIG25.8%
——8Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.2dCVE-2026-749578.1 HIG6.1%
——2Mitigation bypass in the Safe Browsing component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.7h