CVE-2026-67990

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-08-13. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

basecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f disables Rails CSRF protection for its Alertmanager and Prometheus proxy controllers. An unauthenticated attacker can induce a logged-in user's browser to submit requests that are forwarded to enabled upstream write or management endpoints, such as creating an Alertmanager silence or requesting a Prometheus reload. The final impact depends on the APIs enabled by the upstream services.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 13, 2026

Advisory Details (4)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

Public reference for CVE-2026-67990 · GitHub

https://gist.github.com/Zykis1024/cec690012eecac53f408e78d2b569f06
generic

upright/app/controllers/upright/prometheus_proxy_controller.rb at efe4f2e5254ac6e57e45d2261804cca74dbbca3f · basecamp/upright · GitHub

https://github.com/basecamp/upright/blob/efe4f2e5254ac6e57e45d2261804cca74dbbca3f/app/controllers/upright/prometheus_proxy_controller.rb#L2
generic

upright/app/controllers/upright/alertmanager_proxy_controller.rb at efe4f2e5254ac6e57e45d2261804cca74dbbca3f · basecamp/upright · GitHub

https://github.com/basecamp/upright/blob/efe4f2e5254ac6e57e45d2261804cca74dbbca3f/app/controllers/upright/alertmanager_proxy_controller.rb#L2
generic

GitHub - basecamp/upright: Synthetic monitoring engine with Playwright and Prometheus metrics · GitHub

https://github.com/basecamp/upright

Vendor Advisories for CVE-2026-67990(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 06:20 UTCEG score recompute
  2. 2026-08-21 06:20 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 04:23 UTCEG score recompute
  5. 2026-08-20 04:23 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 02:25 UTCEG score recompute
  8. 2026-08-19 02:25 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 00:25 UTCEG score recompute
  11. 2026-08-18 00:24 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 22:22 UTCEG score recompute
  14. 2026-08-16 22:22 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-15 20:25 UTCEG score recompute
  17. 2026-08-15 20:25 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 18:27 UTCEG score recompute
  20. 2026-08-14 18:27 UTCGHSA enrichment
  21. 2026-08-13 16:30 UTCGHSA enrichment
  22. 2026-08-13 15:58 UTCEG score recompute▲ 5.40
  23. 2026-08-13 15:57 UTCGHSA enrichment
  24. 2026-08-13 15:56 UTCMITRE cvelistV5CVSS v3 → 5.4 · severity → MEDIUM
  25. 2026-08-13 14:20 UTCNVD update
Show 2 more
  1. 2026-08-13 13:54 UTCEG score recompute
  2. 2026-08-13 13:51 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67990?
CVE-2026-67990 is a medium vulnerability published on August 13, 2026. basecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f disables Rails CSRF protection for its Alertmanager and Prometheus proxy controllers. An unauthenticated attacker can induce a logged-in user's browser to submit requests that are forwarded to enabled upstream write or management…
When was CVE-2026-67990 disclosed?
CVE-2026-67990 was first published in the National Vulnerability Database on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67990 actively exploited?
CVE-2026-67990 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.2% of all scored CVEs.
What is the CVSS score of CVE-2026-67990?
CVE-2026-67990 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-67990?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67990, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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