CVE-2026-12763

MEDIUMPre-NVD 4.24.2—
EchelonGraph scoreHIGH confidence

Score 4.2 from GitHub Security Advisory published 2026-09-14. a secondary CVSS source baseline 4.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.2Exploit: None knownExposed: 0

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

IBM Langflow OSS 1.0.0 through 1.11.5 could allow an authenticated attacker to access another user's MCP server context due to improper cache key isolation in the MCP Tools component.

CVSS v3
4.2
EG Score
4.2(high)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
Severity42% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

Security Bulletin: Langflow is vulnerable to authentication bypass and insufficient session expiration

https://www.ibm.com/support/pages/node/7286662

Vendor Advisories for CVE-2026-12763(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 22× in last 7d / 22× 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. 2026-09-20 20:23 UTCEG score recompute
  2. 2026-09-20 20:23 UTCGHSA enrichment
  3. 2026-09-20 20:15 UTCEPSS rescore
  4. 2026-09-19 20:11 UTCEG score recompute
  5. 2026-09-19 20:11 UTCGHSA enrichment
  6. 2026-09-18 20:00 UTCEG score recompute
  7. 2026-09-18 20:00 UTCGHSA enrichment
  8. 2026-09-18 19:27 UTCEPSS rescore
  9. 2026-09-17 19:47 UTCEG score recompute
  10. 2026-09-17 19:47 UTCGHSA enrichment
  11. 2026-09-16 19:35 UTCGHSA enrichment
  12. 2026-09-16 18:45 UTCEG score recompute
  13. 2026-09-16 18:45 UTCGHSA enrichment
  14. 2026-09-16 05:14 UTCEPSS rescore
  15. 2026-09-15 18:34 UTCEG score recompute
  16. 2026-09-15 18:34 UTCGHSA enrichment
  17. 2026-09-15 17:39 UTCEG score recompute
  18. 2026-09-15 17:39 UTCGHSA enrichment
  19. 2026-09-14 21:32 UTCEG score recompute
  20. 2026-09-14 21:32 UTCGHSA enrichment
  21. 2026-09-14 20:45 UTCEG score recompute
  22. 2026-09-14 20:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12763?
CVE-2026-12763 is a medium vulnerability published on September 14, 2026. IBM Langflow OSS 1.0.0 through 1.11.5 could allow an authenticated attacker to access another user's MCP server context due to improper cache key isolation in the MCP Tools component.
When was CVE-2026-12763 disclosed?
CVE-2026-12763 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12763 actively exploited?
CVE-2026-12763 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 95.6% of all scored CVEs.
What is the CVSS score of CVE-2026-12763?
CVE-2026-12763 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2026-12763?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12763, 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

Explore the affected products and dependency analysis for CVE-2026-12763

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