Internal access and response tampering via unsafe fetches
Published May 13, 2026 · Updated May 13, 2026
SSRF and improper certificate validation in MISP modules before 3.0.7 allow attackers to access internal resources or tamper with responses. The html_to_markdown module fetched arbitrary HTTP(S) URLs without rejecting loopback, private, or link-local destinations, while qrcode passed remote-image requests with TLS certificate verification disabled. Exploitation requires a caller able to invoke an affected expansion module with an attacker-controlled URL; the resulting access is limited to what the service host can reach or accept from a network intermediary.
Summary
What happened
SSRF and improper certificate validation in MISP modules before 3.0.7 allow attackers to access internal resources or tamper with responses. The html_to_markdown module fetched arbitrary HTTP(S) URLs without rejecting loopback, private, or link-local destinations, while qrcode passed remote-image requests with TLS certificate verification disabled. Exploitation requires a caller able to invoke an affected expansion module with an attacker-controlled URL; the resulting access is limited to what the service host can reach or accept from a network intermediary.
The record
- CVE
- CVE-2026-44363
- Published
- May 13, 2026
- Updated
- May 13, 2026
- Vendor
- MISP Project
- Product
- MISP modules
- Classifications
- CWE-918, CWE-295
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 13, 2026CVE publishedPublication date reported by the CVE source.
- May 13, 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?
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- Affected versionversion=< 3.0.7
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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