CVE-2026-67990Network attack vector

Upstream API writes via disabled CSRF protection

Published Aug 13, 2026 · Updated Aug 13, 2026

Cross-site request forgery in Basecamp Upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f allows remote attackers to send proxied API requests. The AlertmanagerProxyController and PrometheusProxyController disable forgery protection, then forward the browser-controlled method, path, content type, and body to configured upstream services. Exploitation requires a logged-in user's browser to submit the request; resulting writes depend on the upstream APIs enabled.

CVSS severity5.4
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Basecamp Upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f allows remote attackers to send proxied API requests. The AlertmanagerProxyController and PrometheusProxyController disable forgery protection, then forward the browser-controlled method, path, content type, and body to configured upstream services. Exploitation requires a logged-in user's browser to submit the request; resulting writes depend on the upstream APIs enabled.

The record

CVE
CVE-2026-67990
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001User Execution: Malicious Link

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.

Technologies

Your stack

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Your stack

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