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CVE-2026-74959 is a mitigation bypass vulnerability in Mozilla's Storage: Cache API component affecting Firefox and related Mozilla products. The issue allows intended security protections associated with the Cache API component to be bypassed under unspecified conditions. Publicly available information identifies the affected component and fix versions, but does not provide technical detail about the root cause, vulnerable function, or exact exploitation mechanism.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability affecting Debian 13 firefox-esr packages; no further technical details are provided in the content.
A vulnerability referenced by the Thunderbird < 154.0 advisory, but not described individually in the provided content.
A Mozilla Thunderbird vulnerability referenced by the Nessus plugin, but not described in detail in the content.
A Mozilla Thunderbird vulnerability referenced by the Nessus plugin for Thunderbird versions prior to 154.0, but not individually described in the content.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.