What’s Vulnerable › Vulnerabilities

CVE-2020-29565

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-12-04 · updated 2026-06-17
• Weakness: CWE-601

Description

An issue was discovered in OpenStack Horizon before 15.3.2, 16.x before 16.2.1, 17.x and 18.x before 18.3.3, 18.4.x, and 18.5.x. There is a lack of validation of the "next" parameter, which would allow someone to supply a malicious URL in Horizon that can cause an automatic redirect to the provided malicious URL.

Affected products

• Debian Linux: 10.0
• OpenStack Horizon: from 15.3.0 before 15.3.2; from 16.0.0 before 16.2.1; from 17.0.0 before 18.3.3; from 18.4.0 through 18.5.0 — fixed in 15.3.2, 16.2.1, 18.3.3

How to fix

Upgrade to a fixed version: OpenStack Horizon 15.3.2, 16.2.1, 18.3.3. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2020/12/08/2
• https://bugs.launchpad.net/horizon/+bug/1865026
• https://review.opendev.org/c/openstack/horizon/+/758841/
• https://review.opendev.org/c/openstack/horizon/+/758843/
• https://security.openstack.org/ossa/OSSA-2020-008.html
• https://www.debian.org/security/2020/dsa-4820
• http://www.openwall.com/lists/oss-security/2020/12/08/2
• https://bugs.launchpad.net/horizon/+bug/1865026
• https://review.opendev.org/c/openstack/horizon/+/758841/
• https://review.opendev.org/c/openstack/horizon/+/758843/
• https://security.openstack.org/ossa/OSSA-2020-008.html
• https://www.debian.org/security/2020/dsa-4820

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