CVE-2021-26600 json
Type Confusion in ImpressCMS
published 2022-03-28 4 y ago modified 2026-06-17 4 mo ago also GHSA-m8xh-cqc2-5q6f , EUVD-2022-1471
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.6%
- EPSS 5.6% chance of exploitation in 30 days, percentile 92%
- public exploits
- 0
- none known
Summary
ImpressCMS before 1.4.3 has plugins/preloads/autologin.php type confusion with resultant Authentication Bypass (!= instead of !==).
Patch / fix
- packagist impresscms/impresscms 1.4.3
- impresscms impresscms 1.4.3
Exploit prediction
5.63% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- hackerone.com https://hackerone.com/reports/1081986 referenced PoC, tagged "exploit" by a source, unverified
- packetstormsecurity.com http://packetstormsecurity.com/files/166393/ImpressCMS-1.4.2-Authentication-Bypass.html referenced PoC, tagged "exploit" by a source, unverified
- seclists.org http://seclists.org/fulldisclosure/2022/Mar/43 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | impresscms/impresscms | <1.4.3 |
1.4.3 |
Classification
- Weakness
-
- CWE-843 Access of Resource Using Incompatible Type
References
-
hackerone.com
/reports/1081986
web, exploit, third-party-advisory
-
packetstormsecurity.com
/files/166393/ImpressCMS-1.4.2-Authentication-Bypass.html
web, exploit, third-party-advisory, vdb-entry
-
seclists.org
/fulldisclosure/2022/Mar/43
web, exploit, mailing-list, third-party-advisory
-
karmainsecurity.com
/KIS-2022-01
web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-26600
advisory
-
github.com
/ImpressCMS/impresscms
package
-
github.com
/ImpressCMS/impresscms/releases/tag/v1.4.3
web
Sources
- CVE List CVE-2021-26600
- GitHub Advisory GHSA-m8xh-cqc2-5q6f
- NVD CVE-2021-26600
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