EUVD-2026-83906
GHSA-mw89-3hh7-vfpg
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network API, low complexity, requires a low-priv read-only API key (PR:L), no UI; worst-case impact restores full write/delete/admin so C/I/A:H, scope unchanged (same account/app).
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
3DescriptionCVE.org
MISP has a security issue that can let a user gain more access than their API key is supposed to allow.
A read-only API key should only let someone view information. However, after logging in with such a key, a specific MISP function could accidentally restore the user’s normal account permissions. This means someone with a read-only API key could potentially gain write, delete, or even administrator access if their underlying account has those permissions.
Exploiting the issue requires a valid read-only API key and a single request to the affected function.
The main impact is that MISP’s API key restrictions can be bypassed, allowing actions that the API key was specifically meant to prevent.
Version affected: <2.5.47
Articles & Coverage 1
AnalysisAI
Privilege escalation in MISP before version 2.5.47 lets an authenticated holder of a read-only API key silently regain the complete permission set of the underlying user account. After authenticating with a view-only key, a single request to the updateLoginTime function causes MISP to re-login the session using the full account record, effectively discarding the API key's read-only restriction so the caller can perform write, delete, or administrative actions the key was meant to block. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a valid MISP read-only (view-only) API key whose underlying user account holds higher privileges (write, delete, or admin) - the escalation only reaches permissions the account already has, so a read-only account tied to a genuinely low-privilege user gains nothing. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine, high-priority authorization/privilege-escalation flaw despite thin exploitation telemetry. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade MISP to version 2.5.47 or later, which incorporates the vendor fix in commit fd27e592a that replaces the direct Auth->login() re-authentication in updateLoginTime with the _refreshAuth() helper; the patch is available from the vendor and the exact fix commit is published at https://github.com/MISP/MISP/commit/fd27e592a. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all MISP instances and identify any running versions earlier than 2.5.47, and restrict or monitor API keys with read-only privileges, particularly those tied to administrative or high-privilege accounts. …
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External POC / Exploit Code
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