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CVE-2021-26598

34
FAUCET Score

CVE-2021-26598 is an Incorrect Access Control vulnerability affecting ImpressCMS versions prior to 1.4.3. Unauthenticated attackers can exploit a flaw in include/findusers.php to gain unauthorized access, leveraging a security token they are designed to possess. This medium-severity vulnerability (CVSS 5.3) has a low attack complexity and requires no user interaction, potentially leading to information disclosure. While it has a high FAUCET Risk Score and an elevated EPSS score, there is currently no evidence of active exploitation, public exploit code (Metasploit, ExploitDB), or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.4.3CPE matchmatch criteria
cpe:2.3:a:impresscms:impresscms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
10.53%
Probability of exploitation in next 30 days
EPSS Percentile
95.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Nuclei: CVE-2021-26598 · Apr 3, 2022
This CVE's current EPSS score of 0.1053 is in the 94th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

composerpatch availablevia ghsa
Product: impresscms/impresscmsFixed in: 1.4.3

Vendor Advisories (1)

composerGHSA-48p3-xfvw-g59cmedium

Incorrect Access Control in ImpressCMS

Mar 29, 2022

References

karmainsecurity.com / KIS-2022-03
ExploitThird Party Advisory
seclists.org / fulldisclosure/2022/Mar/45
ExploitMailing ListThird Party Advisory
hackerone.com / reports/1081137
ExploitThird Party Advisory
packetstormsecurity.com / files/166403/ImpressCMS-1.4.2-Incorrect-Access-Control.html
ExploitThird Party AdvisoryVDB Entry