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CVE-2021-36426

27
FAUCET Score

CVE-2021-36426 is a critical file upload vulnerability in phpwcms version 1.9.25 that allows remote authenticated attackers to execute arbitrary code. With a CVSS score of 8.8 (High), this flaw can lead to complete compromise of confidentiality, integrity, and availability due to its low attack complexity and lack of user interaction. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there's minimal community discussion or media coverage, the potential for severe impact necessitates prompt patching.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.9.26CPE matchmatch criteria
cpe:2.3:a:phpwcms:phpwcms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.06%
Probability of exploitation in next 30 days
EPSS Percentile
61.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0106 is in the 57th percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / slackero/phpwcms/issues/312
ExploitIssue TrackingPatchThird Party Advisory