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Flask-Security-Too versions 5.3.2 and earlier contain an open redirect vulnerability in the /login and /register routes. An attacker can abuse the next parameter in a crafted URL to cause users to be redirected to an attacker-controlled malicious site.
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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.
next parameter on /login and /register. Enforce server-side validation to reject absolute URLs, protocol-relative URLs, and untrusted domains; normalize redirects to local application paths only; and consider using an allowlist for approved redirect targets. User awareness and anti-phishing controls may reduce downstream risk but do not fix the underlying flaw.Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
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.