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Fencer Vulns
medium 5.3

CVE-2021-26598 json

Incorrect Access Control in ImpressCMS

published 2022-03-28 4 y ago modified 2026-06-17 4 mo ago also GHSA-48p3-xfvw-g59c , EUVD-2022-1301

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
10.5%
EPSS 10.5% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known, plus a Nuclei check

Summary

ImpressCMS before 1.4.3 has Incorrect Access Control because include/findusers.php allows access by unauthenticated attackers (who are, by design, able to have a security token).

Patch / fix

  • packagist impresscms/impresscms 1.4.3
  • impresscms impresscms 1.4.3

Exploit prediction

10.53% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template ImpressCMS <1.4.3 - Incorrect Authorization nuclei detection template
  • hackerone.com https://hackerone.com/reports/1081137 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com https://packetstormsecurity.com/files/166403/ImpressCMS-1.4.2-Incorrect-Access-Control.html referenced PoC, tagged "exploit" by a source, unverified
  • karmainsecurity.com http://karmainsecurity.com/KIS-2022-03 referenced PoC, tagged "exploit" by a source, unverified
  • seclists.org http://seclists.org/fulldisclosure/2022/Mar/45 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist impresscms/impresscms
<1.4.3
1.4.3

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.