MISP Unthrottled Authentication Failure Log Writes Enable Resource Exhaustion

published 2026-09-15 54 d ago modified 2026-09-16 53 d ago also EUVD-2026-78439

cvss: 6.9; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits: 0; none known

Affected versions of MISP do not consistently apply the existing authentication-failure logging throttle.

Two API authentication failure branches wrote directly to the Log model:

- API requests with no authentication key; - requests supplying an API key with an incorrect length

Unlike other authentication failures, these paths bypassed _shouldLog(), so every request could create another durable auth_fail entry.

Version affected: ≤2.5.45

Patch / fix

fixed in 1 links 1

MISP MISP 2.5.46

github.com/MISP/MISP@2bf8874 commit

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 54 d ago (2026-09-15)

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.9	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA	4.0	6.9	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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

Affected products

MISP MISP

Classification

Weakness

CWE-770 Allocation of Resources Without Limits or Throttling
CWE-400 Uncontrolled Resource Consumption

References

github.com /MISP/MISP/commit/2bf887433
patch

Sources

CVE List CVE-2026-92003
NVD CVE-2026-92003

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary