CVE-2025-61505

Name: CVE-2025-61505
Creator: NVD / NIST
Published: 2025-10-10T19:15:38.257+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2025-61505 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.33%

24.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
E107	E107	<= 2.3.3

References

https://github.com/e107inc/e107/blob/master/install.phpProduct
https://xancatos.org/cve202561505Mitigation, Third Party Advisory

Timeline

Published: Oct 10, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-61505?

How severe is CVE-2025-61505?

CVE-2025-61505 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2025-61505?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-61505?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST