CVE Explorer
CVE-2026-31951
LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP (Model Context Protocol) servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can create a malicious MCP server with headers containing `{{LIBRECHAT_OPENID_ACCESS_TOKEN}}` (and others), causing victims who call tools on that server to have their OAuth tokens exfiltrated. Version 0.8.3-rc2 fixes the issue.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"LibreChat","vendor":"danny-avila","versions":[{"status":"affected","version":">= v0.8.2-rc1, <= v0.8.3-rc1"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:91dda3c53600694b5d5fb16344374cf1bda5b22f54f37b1579bd07b9c1347628 · sha256:db0c2c203795efd5… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:91dda3c53600694b5d5fb16344374cf1bda5b22f54f37b1579bd07b9c1347628 · sha256:db0c2c203795efd5… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-200","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:91dda3c53600694b5d5fb16344374cf1bda5b22f54f37b1579bd07b9c1347628 · sha256:db0c2c203795efd5… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"https://github.com/danny-avila/LibreChat/security/advisories/GHSA-pmw7-gqwj-f954","tags":["x_refsource_CONFIRM"],"url":"https://github.com/danny-avila/LibreChat/security/advisories/GHSA-pmw7-gqwj-f954"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:91dda3c53600694b5d5fb16344374cf1bda5b22f54f37b1579bd07b9c1347628 · sha256:db0c2c203795efd5… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.