CVE-2026-90999 Details
Description
Sentry Seer is vulnerable to a multi-stage trust-boundary violation that allows unauthenticated attacker-controlled telemetry to become code that is executed by an agent in a privileged automation environment. An external attacker can submit fabricated Sentry events without having access to the victim’s Sentry account, source repository, or infrastructure.
A multi-stage trust-boundary violation vulnerability has been identified in Sentry Seer, an automated debugging assistant within the Sentry error-monitoring platform. This vulnerability allows unauthenticated, attacker-controlled telemetry to be transformed into executable code within a privileged automation environment. Exploitation occurs when malicious events are submitted through Sentry's public Data Source Name (DSN) endpoint, bypassing multiple trust boundaries and ultimately leading to arbitrary code execution in the coding-agent environment of the affected repository.
As of now, no official patch has been released. Users can disable automated remediation flows, restrict coding-agent package installations, or temporarily disable the Seer handoff feature until a fix is available. Additionally, implementing defensive measures to filter telemetry content before it is analyzed by Seer may help mitigate the risk.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 16, 2026CISA-ADP
Assessed Sep 18, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.kb.cert.org/vuls/id/212479 | CVE | AdvisoryRemedy |
| https://kb.cert.org/vuls/id/212479 | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-116 | Improper Encoding or Escaping of Output | CISA-ADP |
| CWE-20 | Improper Input Validation | CISA-ADP |
| CWE-74 | Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') | CISA-ADP |
| CWE-913 | Improper Control of Dynamically-Managed Code Resources | CISA-ADP |
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| Sentry Seer | All versions |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 18, 2026 | CVE Modified | CISA-ADP |
| Sep 16, 2026 | CVE Modified | CVE |
| Sep 16, 2026 | New CVE Received | [email protected] |