CVE-2020-28724

Open Redirect in werkzeug

6.1 MediumFix available

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

1.68%Up 0.8 points since Apr 14, 2021

What each source reports

NVD Score used 6.1

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Record: CVE-2020-28724
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 5.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:N
Weakness: CWE-601
Updated: 2026-11-02

CVE List No score

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Record: CVE-2020-28724
Updated: 2026-11-02

EUVDEUVD-2020-0241 No score

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Record: EUVD-2020-0241
Updated: 2026-11-03

GitHub AdvisoriesGHSA-3p3h-qghp-hvh2 5.3

Open Redirect in werkzeug

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Record: GHSA-3p3h-qghp-hvh2
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-601
Updated: 2026-11-02

OSV 6.1

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Record: CVE-2020-28724
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2020-28724 6.1

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Record: DEBIAN-CVE-2020-28724
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

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OSVGHSA-3p3h-qghp-hvh2 5.3

Open Redirect in werkzeug

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Record: GHSA-3p3h-qghp-hvh2
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-601
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-28724 6.1

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Record: UBUNTU-CVE-2020-28724
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVPYSEC-2020-157 No score

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Record: PYSEC-2020-157
Updated: 2026-11-02

OSVUSN-4655-1 No score

python-werkzeug vulnerabilities

It was discovered that Werkzeug has insufficient debugger PIN randomness. An attacker could use this issue to access sensitive information. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-14806)

It was discovered that Werkzeug incorrectly handled certain URLs. An attacker could possibly use this issue to cause pishing attacks. This issue only affected Ubuntu 16.04 LTS. (CVE-2020-28724)

Record: USN-4655-1
Updated: 2026-11-02

Affected products

palletsprojects werkzeug

Affected packages

Affected packages
Package	Affected	Fixed
`werkzeug` PyPI	before 0.11.6	0.11.6
`python-werkzeug` Debian:12	before 0.11.9+dfsg1-1	0.11.9+dfsg1-1
`python-werkzeug` Debian:13	before 0.11.9+dfsg1-1	0.11.9+dfsg1-1
`python-werkzeug` Debian:14	before 0.11.9+dfsg1-1	0.11.9+dfsg1-1
`werkzeug` PyPI	before 0.11.6, plus listed versions 0.10.100.10.10.10.20.10.3 Show 31 moreShow less 0.10.40.110.11.10.11.20.11.30.11.40.11.50.20.30.3.10.40.4.10.50.5.10.60.6.10.6.20.70.7.10.7.20.80.8.10.8.20.8.30.90.9.10.9.20.9.30.9.40.9.50.9.6	0.11.6
`werkzeug` PyPI	before 0.11.6, plus listed versions 0.10.20.30.3.10.4 Show 31 moreShow less 0.4.10.50.5.10.60.6.10.6.20.70.7.10.7.20.80.8.10.8.20.8.30.90.9.10.9.20.9.30.9.40.9.50.9.60.100.10.10.10.20.10.30.10.40.110.11.10.11.20.11.30.11.40.11.5	0.11.6
`python-werkzeug` Ubuntu:16.04:LTS	before 0.10.4+dfsg1-1ubuntu1.2, plus listed versions 0.10.4+dfsg1-1ubuntu10.10.4+dfsg1-1ubuntu1.1	0.10.4+dfsg1-1ubuntu1.2
`python-werkzeug` Ubuntu:16.04:LTS From an advisory covering 2 CVEs	before 0.10.4+dfsg1-1ubuntu1.2, plus listed versions 0.10.4+dfsg1-1ubuntu10.10.4+dfsg1-1ubuntu1.1	0.10.4+dfsg1-1ubuntu1.2
`python-werkzeug` Ubuntu:18.04:LTS From an advisory covering 2 CVEs	before 0.14.1+dfsg1-1ubuntu0.1, plus listed versions 0.12.2+dfsg1-20.13+dfsg1-10.14.1+dfsg1-1	0.14.1+dfsg1-1ubuntu0.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-28724 is a medium vulnerability (CVSS 6.1) in Palletsprojects Werkzeug, published November 18, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.68%, the 77th percentile. Fixed in werkzeug 0.11.6.

References

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