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» GHSA-99pm-ch96-ccp2
Description
Impact
Flask-AppBuilder prior to 4.6.2 would allow for a malicious unauthenticated actor to perform an open redirect by manipulating the Host header in HTTP requests.
Patches
Flask-AppBuilder 4.6.2 introduced the FAB_SAFE_REDIRECT_HOSTS configuration variable, which allows administrators to explicitly define which domains are considered safe for redirection.
Examples:
FAB_SAFE_REDIRECT_HOSTS = ["yourdomain.com", "sub.yourdomain.com", "*.yourcompany.com"]
Workarounds
Use a Reverse Proxy to Enforce Trusted Host Headers
References
Are there any links users can visit to find out more?
Basic information
Type
reviewed
Severity
medium Advisory on GitHub
Open advisory ↗ Repository advisory
Open repository advisory ↗ Source code
Browse source ↗ Published (advisory)
2025-05-16 17:28:25 UTC
Updated
2025-05-16 17:28:26 UTC
GitHub reviewed
2025-05-16 17:28:25 UTC
NVD published
2025-05-16
EPSS Score
Score
Percentile
0.20%
41.71%
CVSS Scores
Base score
Version
Severity
Vector
4.3
3.1
—
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
CWEs
CWE id
Name
CWE-601
URL Redirection to Untrusted Site ('Open Redirect')
Affected packages (1)
Vulnerable version ranges and first patched releases as published by GitHub.
Ecosystem
Package
Vulnerable range
First patched
Vulnerable functions
pip
flask-appbuilder < 4.6.2
4.6.2
—
cvelogic
Threat Intelligence