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CVE-2020-4043

29
FAUCET Score

CVE-2020-4043 is a critical deserialization vulnerability affecting phpMussel versions prior to 1.6.0. It allows unauthenticated attackers to achieve arbitrary code execution by uploading a specially crafted file that leverages PHP's phar wrapper. With a CVSS score of 9.8, this vulnerability poses a severe risk due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. Despite its high severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.0.0, < 1.6.0CPE matchmatch criteria
cpe:2.3:a:phpmussel_project:phpmussel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.7HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.1
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.60%
Probability of exploitation in next 30 days
EPSS Percentile
83.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0260 is in the 74th 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 (3)

composerpatch availablevia ghsa
Product: phpmussel/phpmusselFixed in: 1.6.0
composerpatch availablevia ghsa
Product: Maikuolan/phpMusselFixed in: 1.6.0
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-qr95-4mq5-r3fhhigh

Phar unserialization vulnerability in phpMussel

Jun 10, 2020

References

github.com / phpMussel/phpMussel/commit/97f25973433921c1f953430f32d3081adc4851a4
PatchRelease NotesThird Party Advisory
github.com / phpMussel/phpMussel/issues/167
PatchThird Party Advisory
github.com / phpMussel/phpMussel/pull/173
PatchThird Party Advisory
github.com / phpMussel/phpMussel/security/advisories/GHSA-qr95-4mq5-r3fh
MitigationThird Party Advisory
github.com / phpMussel/phpMussel/security/policy
Third Party Advisory