9.8

CVE-2026-55573

CVSS: 9.8v3.1CriticalReceived
Published 2026-10-14Last modified 2026-10-14
Open JSON

Vulnerability summary

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (cve.org)
EPSS score
Not scored
0%100%
No EPSS score yet
KEVNot listed0 of 3 catalogs
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 2026-10-14
    PublishedVulnerability first disclosed.

Description

e107 is a content management system (CMS). Prior to 2.3.7, install.php decodes the attacker-controlled previous_steps POST parameter and passes it to unserialize() at file scope and again in the e_install constructor without restricting allowed classes. The installer remains accessible after a normal installation, and a crafted object graph using the bundled GuzzleHttp\Psr7\PumpStream class can flow through paths.hash into site_path, where string coercion invokes an attacker-controlled callable. An unauthenticated attacker who can reach install.php can therefore execute arbitrary PHP functions with the web server process's privileges, leading to full server compromise. This issue is fixed in version 2.3.7.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

No EPSS score has been published for this record yet.

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

E107inc1 product
  • e107< 2.3.7

1 vendor · 1 product

References

4 links