Affected versions of MISP permit unauthenticated or weakly constrained request paths to perform persistent work without adequate input bounds or rate limiting.
The users/forgot password-reset endpoint accepted an attacker-controlled email value without first imposing a reasonable length bound or validating its format. That value was then used to create an audit log entry and queue a password-reset job, causing the supplied value to be persisted more than once per request. The commit explicitly states that an unbounded unauthenticated request field was stored twice per call with no throttle.
The fix adds:
*
a maximum email input length of 1024 bytes;
*
email-format validation before persistent work;
*
a per-source pre-authentication request budget;
*
HTTP 429 responses when that budget is exceeded;
*
a 15-minute cooldown for API-access request emails;
*
POST-only handling and CSRF protection for the API-access request endpoint.
The new flood filter is specifically intended to limit persistent storage costs from anonymous requests such as password resets, registrations, and failed REST authentication attempts.
Version affected: ≤2.5.45
The users/forgot password-reset endpoint accepted an attacker-controlled email value without first imposing a reasonable length bound or validating its format. That value was then used to create an audit log entry and queue a password-reset job, causing the supplied value to be persisted more than once per request. The commit explicitly states that an unbounded unauthenticated request field was stored twice per call with no throttle.
The fix adds:
*
a maximum email input length of 1024 bytes;
*
email-format validation before persistent work;
*
a per-source pre-authentication request budget;
*
HTTP 429 responses when that budget is exceeded;
*
a 15-minute cooldown for API-access request emails;
*
POST-only handling and CSRF protection for the API-access request endpoint.
The new flood filter is specifically intended to limit persistent storage costs from anonymous requests such as password resets, registrations, and failed REST authentication attempts.
Version affected: ≤2.5.45
Metrics
Affected Vendors & Products
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Fixes
Solution
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Workaround
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References
| Link | Providers |
|---|---|
| https://github.com/MISP/MISP/commit/d75d899be |
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History
Mon, 07 Sep 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Affected versions of MISP permit unauthenticated or weakly constrained request paths to perform persistent work without adequate input bounds or rate limiting. The users/forgot password-reset endpoint accepted an attacker-controlled email value without first imposing a reasonable length bound or validating its format. That value was then used to create an audit log entry and queue a password-reset job, causing the supplied value to be persisted more than once per request. The commit explicitly states that an unbounded unauthenticated request field was stored twice per call with no throttle. The fix adds: * a maximum email input length of 1024 bytes; * email-format validation before persistent work; * a per-source pre-authentication request budget; * HTTP 429 responses when that budget is exceeded; * a 15-minute cooldown for API-access request emails; * POST-only handling and CSRF protection for the API-access request endpoint. The new flood filter is specifically intended to limit persistent storage costs from anonymous requests such as password resets, registrations, and failed REST authentication attempts. Version affected: ≤2.5.45 | |
| Title | MISP Unauthenticated Mail Endpoints Allow Unbounded Storage Consumption and Request Flooding | |
| Weaknesses | CWE-400 CWE-770 |
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| References |
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| Metrics |
cvssV4_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: CIRCL
Published:
Updated: 2026-09-07T13:03:27.052Z
Reserved: 2026-09-07T13:03:25.588Z
Link: CVE-2026-86452
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-07T14:16:56.833
Modified: 2026-09-07T14:16:56.833
Link: CVE-2026-86452
Redhat
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OpenCVE Enrichment
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