CVE-2020-35591

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-02-18 · updated 2026-06-17
Weakness: CWE-384

Description

Pi-hole 5.0, 5.1, and 5.1.1 allows Session Fixation. The application does not generate a new session cookie after the user is logged in. A malicious user is able to create a new session cookie value and inject it to a victim. After the victim logs in, the injected cookie becomes valid, giving the attacker access to the user's account through the active session.

Affected products

pi-hole: 5.0, 5.1, 5.1.1

References

https://discourse.pi-hole.net/c/announcements/5
https://n4nj0.github.io/advisories/pi-hole-multiple-vulnerabilities-i/
https://discourse.pi-hole.net/c/announcements/5
https://n4nj0.github.io/advisories/pi-hole-multiple-vulnerabilities-i/

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