CVE-2023-49438
Open Redirect in Flask-Security-Too Project Flask-Security-Too ≤ 5.3.2
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2023-49438 is a medium-severity Open Redirect (CWE-601) vulnerability in Flask-Security-Too Project Flask-Security-Too. Its CVSS base score is 6.1 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Phishing (T1566); ranked in the top 37% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2023-49438 is an open redirect vulnerability affecting the Flask-Security-Too Python package at version 5.3.2 and earlier. The flaw resides in the handling of the next query parameter on the /login and /register routes, enabling redirection to arbitrary destinations.
An unauthenticated attacker can exploit the issue by supplying a crafted URL containing a malicious next parameter value. Successful abuse redirects a victim user who follows the link to an attacker-controlled site, which may be leveraged for phishing or further social-engineering attacks.
Public references include the upstream Flask-Security repository, a dedicated proof-of-concept repository, and a Fedora package-announce mailing-list posting; these sources constitute the primary locations for any subsequent patch or advisory information.
The associated EPSS score stands at 0.1407 with an identical recorded peak, indicating no material post-disclosure increase in observed exploitation interest.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-0079
Vulnerability Data
An open redirect vulnerability in the python package Flask-Security-Too <=5.3.2 allows attackers to redirect unsuspecting users to malicious sites via a crafted URL by abusing the ?next parameter on the /login and /register routes.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V3.7.2
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly require input validation and untrusted-redirect controls that prevent CWE-601.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Preventing access to attacker-controlled or malicious sites stops users from being redirected to untrusted locations via open-redirect or phishing links.