VulnerabilityPublished 28 Nov 2025

CVE-2025-66386: MISP · CVE-2025-66386 is a path traversal

Affects MISPSource CVE Database V5

Not known to be exploited : upgrade to 2.5.27 when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated Medium by the CNA (mitre) · No CVSS score from NVD or the CNA

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 2.5.27

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Nov 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade misp/MISP to 2.5.27.

Affected software

Product	Affected	Fixed in
GitHubmisp/MISP`pkg:github/misp/MISP`Other threats	Affected <2.5.27	Fixed in 2.5.27

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade all MISP instances to version 2.5.27 or later immediately to ensure the vulnerability is patched.
Restrict site-admin privileges strictly to trusted personnel and enforce strong authentication mechanisms, such as multi-factor authentication (MFA), to reduce the risk of account compromise.
Conduct regular audits of site-admin accounts and their activities to detect any unauthorized access or suspicious behavior.
Implement network segmentation and access controls to limit exposure of MISP servers to only necessary users and systems.
Monitor logs for unusual file access patterns or attempts to exploit path traversal vectors.
Educate site-admin users about the risks of phishing and credential theft to prevent privilege escalation.
If upgrading immediately is not feasible, consider applying temporary access restrictions or disabling picture viewing features for site-admins until a patch is applied.

Description

CVE-2025-66386 is a path traversal vulnerability in the MISP platform prior to version 2.5.27, specifically in the app/Model/EventReport.php component. This flaw allows a site-admin user to manipulate file paths when viewing pictures, potentially accessing unauthorized files on the server. Although exploitation requires site-admin privileges, successful attacks could lead to unauthorized disclosure of sensitive files, impacting confidentiality. There are no known exploits in the wild yet, and no CVSS score has been assigned. The vulnerability affects MISP instances running versions before 2.5.27.

Impact

For European organizations, the impact of CVE-2025-66386 primarily concerns the confidentiality of sensitive threat intelligence data stored within MISP instances. Unauthorized file access could expose internal reports, indicators of compromise, or other classified information shared among trusted partners. This could lead to intelligence leaks, undermining incident response efforts and potentially aiding adversaries. Since exploitation requires site-admin privileges, the risk is heightened if site-admin accounts are compromised or if malicious insiders exist. Availability and integrity impacts are limited, as the vulnerability does not enable direct modification or deletion of data or denial of service. However, the breach of confidentiality alone can have serious consequences for organizations involved in cybersecurity operations, especially those in critical infrastructure sectors or government agencies. The threat is more acute for organizations that heavily rely on MISP for collaborative defense and have not yet updated to the fixed version.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 28 Nov 2025, 07:16 UTC

Technical details

References

Community reviews

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