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Vulnerability record · CVE-2021-26600 · published 28 March 2022

CVE-2021-26600: Impresscms type confusion vulnerability

Impresscms · Impresscms

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

9.8 CVSS 3.1 Critical EPSS 5.6% · top 7.3% CWE-843 · Type confusion
9.8CVSS 3.1 base score, v2 7.5
5.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 6 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://karmainsecurity.com/KIS-2022-01 Third Party Advisory
http://packetstormsecurity.com/files/166393/ImpressCMS-1.4.2-Authentication-Bypass.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2022/Mar/43 ExploitMailing ListThird Party Advisory
https://hackerone.com/reports/1081986 ExploitThird Party Advisory
http://karmainsecurity.com/KIS-2022-01 Third Party Advisory
http://packetstormsecurity.com/files/166393/ImpressCMS-1.4.2-Authentication-Bypass.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2022/Mar/43 ExploitMailing ListThird Party Advisory
https://hackerone.com/reports/1081986 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2008-3453Impresscms vulnerabilityMultiple unspecified vulnerabilities in ImpressCMS 1.0 have unknown impact and attack vectors, related to modules/admin.php and "a few files."EPSS 1.4%9.8CVE-2021-26599Impresscms sql injection vulnerabilityImpressCMS before 1.4.3 allows include/findusers.php groups SQL Injection.EPSS 21%9.8CVE-2022-24977Impresscms path traversal vulnerabilityImpressCMS before 1.4.2 allows unauthenticated remote code execution via ...../// directory traversal in origName or imageName, leading to unsafe int…EPSS 6.4%9.3CVE-2022-50912Impresscms unrestricted file upload vulnerabilityImpressCMS 1.4.4 contains a file upload vulnerability with weak extension sanitization that allows attackers to upload potentially malicious files. A…EPSS 1.1%8.1CVE-2021-26601Impresscms path traversal vulnerabilityImpressCMS before 1.4.3 allows libraries/image-editor/image-edit.php image_temp Directory Traversal.EPSS 3.2%7.5CVE-2010-4271Impresscms sql injection vulnerabilitySQL injection vulnerability in ImpressCMS before 1.2.3 RC2 allows remote attackers to execute arbitrary SQL commands via unspecified vectors.EPSS 1.1%7.2CVE-2022-26986Impresscms sql injection vulnerabilitySQL Injection in ImpressCMS 1.4.3 and earlier allows remote attackers to inject into the code in unintended way, this allows an attacker to read and …EPSS 4.1%7.1CVE-2019-25703Impresscms sql injection vulnerabilityImpressCMS 1.3.11 contains a time-based blind SQL injection vulnerability that allows authenticated attackers to manipulate database queries by injec…EPSS 0.34%

Source: NIST National Vulnerability Database (record CVE-2021-26600), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.