Is there a public PoC exploit available for CVE-2026-15596?

Yes, a public proof-of-concept exploit is available for CVE-2026-15596. Prioritise patching immediately. EPSS: 0.3%.

Timetabling System CVE-2026-15596

Q: What is the CVSS score of CVE-2026-15596?

CVE-2026-15596 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.3%.

LOW

Cross-site Scripting (XSS) (CWE-79)

2026-07-13 VulDB

PHP XSS Class And Exam Timetabling System Sourcecodester

2.1

CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY

2.1 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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:X/V:X/RE:X/U:X

vuln.today AI

6.1 MEDIUM

Network XSS with no privileges required; scope changes to victim browser (S:C) enabling low confidentiality and integrity impact via cookie theft and content injection.

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

4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Severity Changed

Jul 13, 2026 - 22:22 NVD

MEDIUM LOW

CVSS changed

Jul 13, 2026 - 22:22 NVD

5.3 (MEDIUM) 2.1 (LOW)

Analysis Generated

Jul 13, 2026 - 22:12 vuln.today

CVE Published

Jul 13, 2026 - 21:30 cve.org

MEDIUM 5.3

DescriptionCVE.org

A vulnerability was identified in SourceCodester Class and Exam Timetabling System 1.0. The impacted element is an unknown function of the file /subject.php. Such manipulation of the argument subject leads to cross site scripting. It is possible to launch the attack remotely. The exploit is publicly available and might be used.

AnalysisAI

Cross-site scripting in SourceCodester Class and Exam Timetabling System 1.0 exposes users to script injection via the unvalidated subject parameter in /subject.php, exploitable remotely by unauthenticated attackers. A publicly available proof-of-concept exists on GitHub, confirming practical exploitability with minimal attacker skill. No CISA KEV listing is present; the CVSS 4.0 score of 5.3 reflects limited integrity impact constrained by required user interaction, though POC availability meaningfully elevates real-world risk above the raw score suggests.

Technical ContextAI

The vulnerability is a CWE-79 (Improper Neutralization of Input During Web Page Generation - Cross-Site Scripting) flaw in a PHP web application. The affected endpoint /subject.php fails to sanitize or HTML-encode the subject argument before reflecting or persisting it in browser-rendered output. The CPE cpe:2.3:a:sourcecodester:class_and_exam_timetabling_system:*:*:*:*:*:*:*:* uses a wildcard version, indicating NVD has not scoped the flaw to a specific release beyond version 1.0 referenced in the description. SourceCodester distributes free PHP source code projects targeting educational institutions; applications of this type frequently lack security review and are deployed without modification by non-security-focused operators.

RemediationAI

No vendor-released patch has been identified at time of analysis. Operators should immediately implement output encoding on the subject parameter in /subject.php using PHP's htmlspecialchars() with ENT_QUOTES to neutralize injected script content before rendering - this is the primary code-level fix. As a compensating control, deploying a WAF with OWASP ModSecurity Core Rule Set XSS rules can block common payload patterns without code changes, though sophisticated bypasses may still succeed. Restricting access to /subject.php to authenticated sessions reduces the unauthenticated attack surface but may break intended public-facing functionality. Reference the VulDB entry at https://vuldb.com/vuln/378111 and the exploit POC at https://github.com/AlbaDove/cve/issues/5 for technical reproduction details to validate any fix.