Which products and versions are affected by CVE-2021-26598?

Affected: Impresscms; impresscms/impresscms (composer). The full list is in the CVE brief.

Is CVE-2021-26598 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2021-26598 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-26598?

No public exploit code is known.

Is there a fix for CVE-2021-26598?

Fixed versions are available, including Impresscms 1.4.3, impresscms/impresscms 1.4.3.

How urgently should CVE-2021-26598 be patched?

Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

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Vulnerability Intelligence

CVE-2021-26598

Medium

Incorrect Access Control in ImpressCMS

Published Mar 29, 2022 · Updated Jul 8, 2026 · Also known as GHSA-48p3-xfvw-g59c

Key Facts

Routine patching

CVE-2021-26598 is a medium-severity vulnerability (CVSS 5.3 v3.1) affecting Impresscms, impresscms/impresscms (composer).
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 11% probability of exploitation in the next 30 days.
Fixed versions are available, including Impresscms 1.4.3, impresscms/impresscms 1.4.3.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

CVSS v3.1

5.3

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

EPSS (30-day exploit likelihood)

11%

Higher than 95.7% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2021-26598 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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).

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
ImpresscmsImpresscms	See advisory	1.4.3
impresscms/impresscmscomposer	See advisory	1.4.3

Patched Releases

Impresscms

1.4.3

impresscms/impresscms

1.4.3

Timeline

Publicly disclosed
Mar 29, 2022
Last updated
Jul 8, 2026

Weakness Type

CWE-287 Improper Authentication

References

advisoryGHSA advisory
advisoryhttps://github.com/ImpressCMS/impresscms/pull/967
advisoryhttps://github.com/ImpressCMS/impresscms/releases/tag/v1.4.3
advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2021-26598
exploithttp://karmainsecurity.com/KIS-2022-03

4 more references in the full CVE brief

FAQ

Common Questions.

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).
Affected: Impresscms; impresscms/impresscms (composer). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Impresscms 1.4.3, impresscms/impresscms 1.4.3.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

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