Unauthorized metadata injection via parser confusion
Published Aug 21, 2026 · Updated Aug 21, 2026
Improper input validation in MISP-STIX 2026.7.8 and earlier allows remote attackers to inject MISP attribute metadata via STIX imports. Parser selection trusts producer-controlled labels, then the internal STIX2 parser passes unrestricted x_misp_attributes fields to add_attribute(). Exploitation requires an imported STIX document; injected distribution, sharing-group, or tag fields can alter sharing policy and downstream automation.
Summary
What happened
Improper input validation in MISP-STIX 2026.7.8 and earlier allows remote attackers to inject MISP attribute metadata via STIX imports. Parser selection trusts producer-controlled labels, then the internal STIX2 parser passes unrestricted x_misp_attributes fields to add_attribute(). Exploitation requires an imported STIX document; injected distribution, sharing-group, or tag fields can alter sharing policy and downstream automation.
The record
- CVE
- CVE-2026-77710
- Published
- Aug 21, 2026
- Updated
- Aug 21, 2026
- Vendor
- MISP
- Product
- MISP-STIX
- Classifications
- CWE-20, CWE-915, CWE-807, CAPEC-153, T1565.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 21, 2026CVE publishedPublication date reported by the CVE source.
- Aug 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=2026.7.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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