Critical severity · published Feb 9, 2026
CVE-2026-25923
Phar Deserialization leading to Arbitrary File Deletion in my little forum
9.1
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MY
mylittleforum · My-Little-Forum
< 20260208.1 · source: vendor
ML
MY Little Forum · Mylittleforum
before 20260208.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25923
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-25923
Product
https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1
Exploit
https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3c3g-78fw
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