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CVE-2026-86452 – Unauthenticated Denial of Service via Unbounded Storage Consumption – MISP ≤2.5.45

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Summary

CVE-2026-86452 is an uncontrolled resource consumption vulnerability in MISP’s unauthenticated password-reset and API-access-request endpoints. Versions up to and including 2.5.45 accepted attacker-supplied email input with no length limit, format validation, or rate limiting, allowing remote unauthenticated flooding that exhausts storage and processing resources. The issue carries a HIGH severity rating (CVSS 8.7).

Technical details

  • Root cause: the users/forgot password-reset endpoint accepted arbitrary-length, unvalidated email values and persisted this attacker-controlled data twice per request, with no throttling in place.
  • The related request_API endpoint could also be invoked repeatedly without a cooldown, compounding the resource-exhaustion potential.
  • Trigger conditions: an unauthenticated attacker sends repeated POST/GET requests to these endpoints with oversized or malformed email values.
  • Attack vector: network, no authentication or user interaction required.
  • Impact: uncontrolled resource consumption and denial of service (availability impact), through storage/queue growth and lack of request throttling.

Affected software

  • MISP versions 0 through 2.5.45 (all versions up to and including 2.5.45)

Severity

CVSS v4.0 Base Score: 8.7 (HIGH)
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: upgrade to a MISP release containing the fix that caps email input at 1,024 bytes, adds format validation before storage, and enforces a pre-authentication flood filter (default 100 requests per 15-minute window, HTTP 429 on exceedance) as well as a 15-minute per-user cooldown on the API-access-request endpoint.
  • If patching is not immediately possible: place the MISP instance behind a reverse proxy or WAF that rate-limits requests to users/forgot and the API-access-request endpoint per source IP, and monitor for abnormal request volumes to unauthenticated mail-related endpoints.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Set-Cookie response header: MISP-
  • Raw response body: href="https://github.com/MISP/MISP"
  • Loaded script URL: /js/misp.js

References

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1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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