What’s Vulnerable › Vulnerabilities

CVE-2021-26600

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-28 · updated 2026-06-17
• Weakness: CWE-843

Description

ImpressCMS before 1.4.3 has plugins/preloads/autologin.php type confusion with resultant Authentication Bypass (!= instead of !==).

Affected products

• ImpressCMS: before 1.4.3 — fixed in 1.4.3

How to fix

Upgrade to a fixed version: ImpressCMS 1.4.3. Check the vendor advisory for mitigations.

References

• http://karmainsecurity.com/KIS-2022-01
• http://packetstormsecurity.com/files/166393/ImpressCMS-1.4.2-Authentication-Bypass.html
• http://seclists.org/fulldisclosure/2022/Mar/43
• https://hackerone.com/reports/1081986
• http://karmainsecurity.com/KIS-2022-01
• http://packetstormsecurity.com/files/166393/ImpressCMS-1.4.2-Authentication-Bypass.html
• http://seclists.org/fulldisclosure/2022/Mar/43
• https://hackerone.com/reports/1081986

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