Secuno
ENNL
Book demo

CVE-2026-25923

Mylittleforum My Little Forum insecure deserialization

9.1 CRITICALPublic exploitEPSS 0.73%
  1. Published9 Feb 2026

Description

my little forum is a PHP and MySQL based internet forum that displays the messages in classical threaded view. Prior to 20260208.1, the application fails to filter the phar:// protocol in URL validation, allowing attackers to upload a malicious Phar Polyglot file (disguised as JPEG) via the image upload feature, trigger Phar deserialization through BBCode [img] tag processing, and exploit Smarty 4.1.0 POP chain to achieve arbitrary file deletion. This vulnerability is fixed in 20260208.1.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Mylittleforum My Little Forum< 20260208.1

Remediation

Fixed in
Mylittleforum My Little Forum≥ 20260208.1

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1092378.1
Crawl4AI from 0.9.0 before 0.9.4 contains an untrusted-config gate bypass that allows…
CVE-2026-1093918.1
Square Squash through commit e73f280 contains an insecure deserialization vulnerability…
CVE-2026-126138.8
Deserialization of untrusted data vulnerability in Ministry of Justice General…
CVE-2026-529038.8
A deserialization of untrusted data vulnerability was found in ManageIQ. The…
CVE-2026-1040289.8
The Anton Extensions WordPress plugin through 1.2.2 does not perform any capability…
CVE-2026-817979.8
Unauthenticated PHP Object Injection in Buzz Stone | Magazine & Viral Blog WordPress…

Frequently asked

Is CVE-2026-25923 being actively exploited?

CVE-2026-25923 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.73%.

How severe is CVE-2026-25923?

CVE-2026-25923 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.73% probability of exploitation.

Which products are affected by CVE-2026-25923?

Affected products include Mylittleforum My Little Forum.

How do I fix CVE-2026-25923?

Upgrade affected software to a fixed version, for example Mylittleforum My Little Forum 20260208.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-25923 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.