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A cross-site scripting filter bypass vulnerability in Microsoft Internet Explorer 8 through 11 allows a remote attacker to evade the browser’s built-in XSS filter by using a crafted HTML element attribute. The flaw affects the browser-side XSS protection mechanism rather than the target web application itself. By causing the filter to incorrectly disable or fail to enforce protection on certain HTML attributes, an attacker can bypass this defense layer and execute malicious script in an unintended security context. Microsoft identified this issue as the Internet Explorer XSS Filter Bypass Vulnerability and addressed it in cumulative update 3008923.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Internet Explorer XSS filter bypass vulnerability that could allow script to run in the wrong security context, leading to information disclosure/security feature bypass.
Internet ExplorerのXSSフィルタにおける純粋なバイパスとして言及されている脆弱性。
A pure XSS-filter bypass vulnerability in Internet Explorer discussed as an example of browser filter bypass issues.
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.