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Vulnerability record · CVE-2026-25923 · published 9 February 2026

CVE-2026-25923: Mylittleforum my little forum unrestricted file upload vulnerability

Mylittleforum · My Little Forum

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.

8.7 CVSS 4.0 High EPSS 0.65% · top 50.8% CWE-434 · Unrestricted file uploadCWE-502 · Deserialization of untrusted data
8.7CVSS 4.0 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1 ProductRelease Notes
https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3c3g-78fw ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2010-2133Mylittleforum my little forum sql injection vulnerabilitySQL injection vulnerability in contact.php in My Little Forum allows remote attackers to execute arbitrary SQL commands via the id parameter, a diffe…EPSS 2.0%6.5CVE-2019-12253Mylittleforum my little forum cross-site request forgery vulnerabilitymy little forum before 2.4.20 allows CSRF to delete posts, as demonstrated by mode=posting&delete_posting.EPSS 0.60%6.5CVE-2018-15569Mylittleforum my little forum cross-site request forgery vulnerabilitymy little forum 2.4.12 allows CSRF for deletion of users.EPSS 0.41%6.5CVE-2015-1434Mylittleforum my little forum sql injection vulnerabilityMultiple SQL injection vulnerabilities in my little forum before 2.3.4 allow remote administrators to execute arbitrary SQL commands via the (1) lett…EPSS 1.8%4.8CVE-2018-14936Mylittleforum my little forum cross-site scripting vulnerabilityThe Add page option in my little forum 2.4.12 allows XSS via the Title field.EPSS 0.91%4.8CVE-2018-14937Mylittleforum my little forum cross-site scripting vulnerabilityThe Add page option in my little forum 2.4.12 allows XSS via the Menu Link field.EPSS 0.91%4.3CVE-2015-1435Mylittleforum my little forum cross-site scripting vulnerabilityCross-site scripting (XSS) vulnerability in my little forum before 2.3.4 allows remote attackers to inject arbitrary web script or HTML via the back …EPSS 2.4%4.3CVE-2015-1475Mylittleforum my little forum cross-site scripting vulnerabilityMultiple cross-site scripting (XSS) vulnerabilities in my little forum 2.3.3, 2.2, and 1.7 allow remote attackers to inject arbitrary web script or H…EPSS 1.9%

Source: NIST National Vulnerability Database (record CVE-2026-25923), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.