CVE-2026-88921Network attack vector

Authenticated HTML injection via unescaped PDF elements

Published Sep 10, 2026 · Updated Sep 10, 2026

HTML injection in MISP 2.5.45 and earlier allows remote authenticated users to alter exported PDF reports with crafted elements. The MISPElementHTMLFormatterTool attribute(), objectAttribute(), object(), and tag() methods place user-controlled element fields into HTML templates without entity encoding. Write access to an included attribute, object, or tag and a later PDF export are required; injected markup can change document structure or execute in the conversion engine.

CVSS severityUnavailable
Unscored
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in MISP 2.5.45 and earlier allows remote authenticated users to alter exported PDF reports with crafted elements. The MISPElementHTMLFormatterTool attribute(), objectAttribute(), object(), and tag() methods place user-controlled element fields into HTML templates without entity encoding. Write access to an included attribute, object, or tag and a later PDF export are required; injected markup can change document structure or execute in the conversion engine.

The record

CVE
CVE-2026-88921
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
MISP Project
Product
MISP
Classifications
Unavailable
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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.

  1. Affected versionversion=unspecified <2.5.46

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MISP Project · MISPversion=unspecified <2.5.46

Published CVSS scores

No CVSS assessment is available in this record.

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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