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CVE-2021-26599

62
FAUCET Score

CVE-2021-26599 is a critical SQL Injection vulnerability affecting ImpressCMS versions prior to 1.4.3, specifically within the include/findusers.php component. This vulnerability carries a CVSS score of 9.8, indicating a severe risk due to its network-based attack vector, low attack complexity, and potential for complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation in the wild and it is not listed in CISA's KEV catalog, public exploit code exists, including a Nuclei template for detection and an ExploitDB entry detailing a Remote Code Execution (RCE) exploit. Despite the availability of exploit code, community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.4.4CPE matchmatch criteria
cpe:2.3:a:impresscms:impresscms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
20.97%
Probability of exploitation in next 30 days
EPSS Percentile
97.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-26599 · Jun 3, 2025
ExploitDB: EDB-50839 · Mar 30, 2022
This CVE's current EPSS score of 0.2097 is in the 94th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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-jc4v-vvg6-xg78critical

SQL Injection in ImpressCMS

Mar 29, 2022

References

karmainsecurity.com / KIS-2022-04
ExploitThird Party Advisory
packetstormsecurity.com / files/166404/ImpressCMS-1.4.2-SQL-Injection.html
ExploitThird Party AdvisoryVDB Entry
seclists.org / fulldisclosure/2022/Mar/46
ExploitMailing ListThird Party Advisory
hackerone.com / reports/1081145
Permissions RequiredThird Party Advisory