What is CVE-2025-61505?

CVE-2025-61505 is a medium-severity vulnerability in E107, classified under Deserialization of Untrusted Data. CVSS score: 6.5/10. Published 2025-10-10.

How severe is CVE-2025-61505?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2025-61505 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in E107

CVE-2025-61505

e107 CMS thru 2.3.3 are vulnerable to insecure deserialization in the `install.php` script. The script processes user-controlled input in the `previous_steps` POST parameter using `unserialize(base64_decode())` without validation, allowing attackers to craft malicious serialized data. This could lead to remote code execution, arbitrary file operations, or denial of service, depending on available PHP object gadgets in the codebase.

Vulnerability class: Insecure Deserialization

EPSS: 0.003 (25.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

E107
N/a — versions n/a

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

cve@mitre.org (Product)
cve@mitre.org (Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2025-61505?: CVE-2025-61505 is a medium-severity vulnerability in E107, classified under Deserialization of Untrusted Data. CVSS score: 6.5/10. Published 2025-10-10.
How severe is CVE-2025-61505?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2025-61505 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.