CVE-2026-15134: Online Leave Management System SQLi Flaw

CVE-2026-15134 Overview

CVE-2026-15134 is a SQL injection vulnerability in CodeAstro Simple Online Leave Management System 1.0. The flaw resides in the /SimpleOnlineLeave/index.php file, where the email parameter is passed to a backend database query without proper sanitization. Remote attackers can manipulate the email argument to inject arbitrary SQL statements. The exploit has been publicly disclosed, increasing the likelihood of opportunistic attacks against exposed installations. This issue is classified under [CWE-74] as improper neutralization of special elements in output used by a downstream component.

Critical Impact
Unauthenticated remote attackers can inject SQL statements through the email parameter, potentially compromising confidentiality, integrity, and availability of the underlying database.

Affected Products

CodeAstro Simple Online Leave Management System 1.0
Deployments exposing /SimpleOnlineLeave/index.php to untrusted networks
Downstream forks or customizations that retain the vulnerable email handling logic

Discovery Timeline

2026-07-09 - CVE CVE-2026-15134 published to NVD
2026-07-09 - Last updated in NVD database

Technical Details for CVE-2026-15134

Vulnerability Analysis

The vulnerability exists in the login or authentication logic served by /SimpleOnlineLeave/index.php. The application accepts the email argument from HTTP requests and concatenates the value into a SQL query without parameterization or input escaping. This lets attackers break out of the intended string context and append additional SQL clauses. Because the endpoint is reachable pre-authentication, no valid account or session is required to reach the injection sink. The impact covers data confidentiality, integrity, and availability, though each dimension is rated as limited in the CVSS 4.0 assessment. Public disclosure of the technique on VulDB and GitHub increases the risk of automated scanning and exploitation.

Root Cause

The root cause is improper neutralization of user-supplied input inserted into a SQL statement [CWE-74]. The email parameter is not validated, escaped, or bound as a prepared statement parameter before being embedded in the query executed against the leave management database.

Attack Vector

An attacker sends a crafted HTTP request to /SimpleOnlineLeave/index.php with a malicious payload in the email field. The payload closes the original string literal, appends attacker-controlled SQL, and comments out the remainder of the query. Successful injection can enumerate database schema, extract employee records, bypass authentication, or manipulate leave data. The attack requires no privileges, no user interaction, and can be executed remotely over the network.

No verified proof-of-concept code has been vetted for inclusion. Refer to the GitHub Issue CVE-2026-15134 and VulDB CVE-2026-15134 entries for technical detail.

Detection Methods for CVE-2026-15134

Indicators of Compromise

HTTP POST or GET requests to /SimpleOnlineLeave/index.php containing SQL metacharacters such as ', --, UNION, SELECT, or OR 1=1 in the email parameter.
Unexpected database error messages or verbose SQL responses returned in HTTP replies from the leave management application.
Anomalous outbound queries from the application's database account reading sensitive tables such as users, employees, or credentials.

Detection Strategies

Deploy web application firewall (WAF) rules that flag SQL injection payloads targeting the email field on the /SimpleOnlineLeave/ path.
Enable database query logging and alert on queries containing tautologies, UNION SELECT, or INFORMATION_SCHEMA references originating from the leave management service account.
Correlate authentication failures on index.php with malformed input patterns to identify brute injection attempts.

Monitoring Recommendations

Monitor HTTP request logs for repeated failed logins paired with SQL syntax in the email parameter.
Track database CPU and query volume for spikes that align with scraping or blind injection behavior.
Alert on any new administrative accounts, altered leave records, or unauthorized reads of user tables in the application database.

How to Mitigate CVE-2026-15134

Immediate Actions Required

Restrict network access to /SimpleOnlineLeave/index.php using firewall rules, VPN, or IP allowlisting until a patched build is available.
Deploy WAF signatures that block SQL injection payloads targeting the email parameter.
Audit the application database for signs of unauthorized reads, account creation, or record tampering.

Patch Information

No official vendor patch is referenced in the advisory data. Track vendor updates via the CodeAstro Security Resource and monitor the VulDB Vulnerability #376949 entry for remediation guidance. If no patch is released, apply source-level fixes by replacing string concatenation with parameterized queries or prepared statements for all uses of the email argument.

Workarounds

Modify /SimpleOnlineLeave/index.php to use prepared statements with bound parameters for all database calls involving email.
Add server-side input validation that rejects email values containing SQL metacharacters or exceeding expected length.
Run the application database account with least privilege, removing rights to DROP, ALTER, and access to unrelated schemas.

bash

# Example ModSecurity rule to block SQL injection attempts on the email parameter
SecRule REQUEST_URI "@contains /SimpleOnlineLeave/index.php" \
    "chain,phase:2,deny,status:403,id:1015134,msg:'CVE-2026-15134 SQLi attempt'"
    SecRule ARGS:email "@rx (?i)(union\s+select|or\s+1=1|--|;|/\*)" "t:none"