CVE-2026-90999Known exploitationNetwork attack vector

Supply-chain compromise via telemetry prompt injection

Published Sep 16, 2026 · Updated Sep 18, 2026

Prompt injection in Sentry Seer allows remote attackers to steer automated fixes through fabricated public-DSN telemetry events. The telemetry path accepts attacker-supplied error text as issue context, which Seer can interpret as instructions during automated analysis and fixing. A public DSN and enabled automation expose the path; observed prompts sought credential-stealing npm package installation, but Sentry disputes that the incident is a vulnerability.

CVSS severityUnavailable
Unscored
EPSS probability0.67%
Next 30 days · Oct 19, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prompt injection in Sentry Seer allows remote attackers to steer automated fixes through fabricated public-DSN telemetry events. The telemetry path accepts attacker-supplied error text as issue context, which Seer can interpret as instructions during automated analysis and fixing. A public DSN and enabled automation expose the path; observed prompts sought credential-stealing npm package installation, but Sentry disputes that the incident is a vulnerability.

The record

CVE
CVE-2026-90999
Published
Sep 16, 2026
Updated
Sep 18, 2026
Vendor
Sentry
Product
Sentry Seer
Classifications
T1195.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2026Exploitation reportedPublic-DSN prompt-injection supply-chain campaign
  2. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  3. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=Web site

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sentry · Sentry Seerversion=Web site

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

T1195.001Compromise Software Dependencies and Development Tools

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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