Critical 9.8Published Oct 14, 2026

CVE-2026-55573e107: Unsafe deserialization in install.php allows unauthenticated RCE via POP chain

Updated under an hour ago (2026-10-19 09:00 UTC)

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It affects e107inc e107. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.60%, higher than 47% of scored CVEs.

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Every CVE for e107inc e107

Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-502
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.60% (percentile 47)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

e107inc e107 e107inc:e107 (from the name)	before 2.3.7	CNA record

References

https://github.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8x-refsource-confirm
https://github.com/e107inc/e107/commit/5d6d649e8cf01854d6024d07997c2449fdd75f24x-refsource-misc
https://github.com/e107inc/e107/commit/6c404295213952aedb9b3689be19dd4c7ba550b0x-refsource-misc
https://github.com/e107inc/e107/releases/tag/v2.3.7x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.