CVE-2026-41487

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 92% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 0

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

Langfuse is an open source large language model engineering platform. From version 3.68.0 to before version 3.167.0, there is a role-based-access control flaw in the LLM connection update flow. An authenticated, low-privileged user of role “member” in a project could request the update of an existing LLM connection to an attacker-controlled baseUrl, causing Langfuse to reuse the stored provider secret and redirect the test request to an attacker-controlled endpoint. This could expose the plaintext provider LLM API key for that connection. The attack is only possible if a user is already part of a project and has “member” scoped access. This issue has been patched in version 3.167.0.

CVSS v3
5.4
EG Score
5.4(medium)
EPSS
7.9%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 13, 2026

Advisory Details (6)

Auto-updated Jun 17, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available🟡 PoC Available

Improper role-based-access control in Langfuse LLM connection management allowed users of role “member” to retrieve stored LLM provider API keys · Advisory · langfuse/langfuse · GitHub

https://github.com/langfuse/langfuse/security/advisories/GHSA-2524-j966-gfgh
github_release Patch Available

v3.167.0

Patch available: langfuse/langfuse v3.167.0

https://github.com/langfuse/langfuse/releases/tag/v3.167.0
github_pr Patch Available

fix(web): require secret key for LLM test base URL changes

Patch available: langfuse/langfuse v3.167.1 (PR #13055 merged 2026-04-09)

https://github.com/langfuse/langfuse/pull/13055
github_pr Patch Available

fix(llm-connections): enforce write permissions on LLM connection test endpoints

Patch available: langfuse/langfuse v3.167.1 (PR #13027 merged 2026-04-08)

https://github.com/langfuse/langfuse/pull/13027
github_commit Patch Available

commit e12386f9d436 (langfuse/langfuse)

Patch available: langfuse/langfuse v3.167.1 (contains commit e12386f9d436)

https://github.com/langfuse/langfuse/commit/e12386f9d4368bbfff24a4ad7fd53641091605ff
github_commit Patch Available

commit 7527bb0d84bc (langfuse/langfuse)

Patch available: langfuse/langfuse v3.167.1 (contains commit 7527bb0d84bc)

https://github.com/langfuse/langfuse/commit/7527bb0d84bc0a3dc24a4b16d22ed2e46e6dddff

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 38× 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. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-24 14:05 UTCEPSS rescore
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  71. 2026-05-20 11:22 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-41487?
CVE-2026-41487 is a medium vulnerability published on May 8, 2026. Langfuse is an open source large language model engineering platform. From version 3.68.0 to before version 3.167.0, there is a role-based-access control flaw in the LLM connection update flow. An authenticated, low-privileged user of role “member” in a project could request the update of an…
When was CVE-2026-41487 disclosed?
CVE-2026-41487 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41487 actively exploited?
CVE-2026-41487 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41487?
CVE-2026-41487 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-41487?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41487, 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.

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