CVE-2026-40841: Unauthenticated SQL Injection Vulnerability

CVE-2026-40841 Overview

CVE-2026-40841 is a SQL injection vulnerability in the getProjectTags function caused by improper neutralization of special elements within a SQL SELECT command [CWE-89]. A low-privileged remote attacker can exploit the flaw over the network without user interaction. Successful exploitation results in a total loss of confidentiality of data accessible to the backend database.

The vulnerability is tracked under CERTVDE Advisory VDE-2026-044. The advisory describes the issue as unauthenticated SQL injection, although the CVSS vector indicates low privileges are required to reach the affected function.

Critical Impact
Remote attackers with low privileges can extract sensitive data from the backend database by injecting crafted input into the getProjectTags function, leading to total compromise of data confidentiality.

Affected Products

Specific affected products are listed in CERTVDE Advisory VDE-2026-044
No CPE entries were published in the NVD record at the time of disclosure
Vendor and product identifiers are not yet populated in NVD metadata

Discovery Timeline

2026-05-27 - CVE-2026-40841 published to NVD
2026-05-27 - Last updated in NVD database

Technical Details for CVE-2026-40841

Vulnerability Analysis

The vulnerability resides in the getProjectTags function, which constructs a SQL SELECT statement using attacker-controlled input. The function fails to neutralize special characters such as single quotes, comments, and statement terminators before concatenating them into the query string.

An attacker who can reach the function over the network can append additional SQL clauses, including UNION SELECT statements, to read arbitrary rows from accessible tables. The CVSS 4.0 vector indicates only the confidentiality dimension is affected, meaning integrity and availability remain intact in the documented attack scenarios.

Because the underlying weakness is classified under CWE-89, it follows the standard pattern of unsafe string concatenation in place of parameterized queries.

Root Cause

The getProjectTags function builds SQL queries through direct string concatenation rather than using prepared statements with bound parameters. Input that should be treated as data is instead interpreted as part of the query structure. The absence of an allowlist for tag identifiers or an escaping routine for SQL metacharacters allows the injection.

Attack Vector

The vulnerability is reachable over the network from any client that can submit a request to the endpoint hosting getProjectTags. The attacker authenticates with low-privileged credentials, then sends a tag query containing SQL syntax. The injected payload executes in the database context, returning records the attacker would otherwise lack permission to view.

No verified proof-of-concept code has been published. Refer to the CERTVDE Advisory VDE-2026-044 for vendor-supplied technical details and reproduction guidance.

Detection Methods for CVE-2026-40841

Indicators of Compromise

Application or web server logs containing SQL metacharacters (', --, ;, /*, UNION, SELECT) within parameters processed by the getProjectTags endpoint
Database query logs showing malformed or unusually long SELECT statements referencing tag tables
Authenticated low-privilege sessions issuing high volumes of tag-related requests in short time windows
Database error messages returned to clients that reveal table or column names

Detection Strategies

Deploy a web application firewall ruleset that inspects parameters submitted to the getProjectTags endpoint for SQL syntax patterns
Enable verbose database query logging and alert on queries containing UNION SELECT, information_schema, or stacked statements originating from the application service account
Correlate authentication events with subsequent tag-query activity to identify low-privileged accounts performing reconnaissance

Monitoring Recommendations

Continuously monitor outbound data volumes from the database host for anomalies consistent with bulk extraction
Alert on application accounts accessing tables outside their normal query profile
Review failed query patterns that indicate blind or time-based SQL injection probing

How to Mitigate CVE-2026-40841

Immediate Actions Required

Consult CERTVDE Advisory VDE-2026-044 for the fixed version and apply the vendor patch as soon as it is available
Restrict network access to the affected application so only trusted users can reach the getProjectTags endpoint
Rotate credentials for low-privileged accounts that may have been used to probe the vulnerability
Audit database logs for evidence of prior exploitation since the application's deployment

Patch Information

The authoritative source for fixed versions and patch availability is CERTVDE Advisory VDE-2026-044. At the time of NVD publication on 2026-05-27, the affected product list had not been populated in the NVD record. Administrators should track the CERT@VDE advisory for updates.

Workarounds

Place a web application firewall in front of the application with rules that block SQL metacharacters in tag-related parameters
Limit the database account used by the application to the minimum tables and columns required, reducing the data exposed if injection succeeds
Disable or gate the getProjectTags functionality until a patched build is deployed, if business processes allow

bash

# Example WAF rule (ModSecurity) to block common SQLi patterns on the affected endpoint
SecRule REQUEST_URI "@contains /getProjectTags" \
    "id:1040841,phase:2,deny,status:403,\
    msg:'Possible SQLi against getProjectTags (CVE-2026-40841)',\
    chain"
    SecRule ARGS "@rx (?i)(union(\s|/\*.*\*/)+select|--|;|/\*|information_schema|sleep\s*\()" \
        "t:none,t:urlDecodeUni"