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CVE-2021-26600ImpressCMS before 1.4.3 has plugins/preloads/autologin.php type confusion with resultant Authentication Bypass (!= instead of !==).
- 9.8CriticalCVSS base score
- 5.6%Exploitation in 30 daysEPSS · top 6.9% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
ImpressCMS before 1.4.3 has plugins/preloads/autologin.php type confusion with resultant Authentication Bypass (!= instead of !==).
Timeline
ID reserved
By mitre
- 14 months later
· 14 months later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 5.6% · top 6.9% of all CVEs (13 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
n/a
- affected n/a
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Packagistimpresscms/impresscmsGHSA-m8xh-cqc2-5q6f (opens in a new tab)
References
References4
- https://hackerone.com/reports/1081986 (opens in a new tab)x_refsource_MISCx_transferred
- http://packetstormsecurity.com/files/166393/ImpressCMS-1.4.2-Authentication-Bypass.html (opens in a new tab)x_refsource_MISCx_transferred
- http://seclists.org/fulldisclosure/2022/Mar/43 (opens in a new tab)x_refsource_MISCx_transferred
- http://karmainsecurity.com/KIS-2022-01 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2022-1471 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-m8xh-cqc2-5q6f (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-26600)Record last updated .