CVE-2026-90895: MISP Interactive CLI Shell: Authorization Bypass, Credential Exposure, and Terminal Injection

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of 29 Oct 2026. If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?

0.1%

EPSS score, percentile 4.1 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

8.4 High

CVSS v4.0 base score, given by the CNA

What should I do?

The fix replaces the shell's hand-rolled authorization logic with the same model-level accessors used by the web interface (Event::fetchSimpleEvent … Full textSolution from the CVE record.

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

• before 2.5.46

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; FIRST EPSS, as of 29 Oct 2026; CVE List, as of 29 Oct 2026. About the data.

What to do

Solution (from the CVE record)

The fix replaces the shell's hand-rolled authorization logic with the same model-level accessors used by the web interface (Event::fetchSimpleEvent, MispAttribute::fetchAttributes, MispObject::fetchObjects, SharingGroup::checkIfAuthorised, Organisation::canSee), ensuring read and write operations enforce identical ACL rules. Credential columns are excluded at the query level via a hiddenFields mechanism so they are never fetched from the database. The inline detail editor now delegates to the entity-specific edit handlers, which enforce per-record write authorization. All terminal output passes through a sanitiser that neutralises C0/C1 control characters, ANSI escape sequences, and Unicode bidirectional overrides. Pagination is clamped to a safe range (1-1000) to prevent unbounded result sets.

Advisories and patches

• Security patch (Patch)

This summary is based on the CVE record as of 29 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

As listed in the CVE record.

Source: CVE List, as of 29 Oct 2026. About the data.

About this vulnerability

Affected versions of MISP’s interactive CLI shell implement access control independently from the normal web application, causing several authorization inconsistencies. The patch shows that CLI access could differ from the web application in multiple security-sensitive areas:  - feed listings did not enforce the same lookup_visible restrictions for non-host-organisation users;  - feed detail a…

Summary: CVE record, as of 29 Oct 2026.

• CISA has not added CVE-2026-90895 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
• The CVE record was published on 14 Sep 2026.
• The CVE record carries a CVSS v4.0 base score of 8.4 (High), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.1% (percentile 4.1), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
• CISA's SSVC assessment in the CVE record: exploitation none, automatable no, technical impact total.
• The credits in the CVE record name Anthropic (Claude) as finder.

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; CVE List, as of 29 Oct 2026; FIRST EPSS, as of 29 Oct 2026. About the data.

Description

MISP Interactive CLI Shell: Authorization Bypass, Credential Exposure, and Terminal Injection

Affected versions of MISP’s interactive CLI shell implement access control independently from the normal web application, causing several authorization inconsistencies. The patch shows that CLI access could differ from the web application in multiple security-sensitive areas:  - feed listings did not enforce the same lookup_visible restrictions for non-host-organisation users;  - feed detail access did not enforce the same host-organisation/site-admin authorization as FeedsController::view();  - Feed.headers, which can contain HTTP authorization credentials, could be exposed instead of being hidden or masked;  - server synchronization authkey values were not explicitly hidden from CLI detail output;  - sharing-group detail access did not consistently use SharingGroup::checkIfAuthorised();  - the use command could establish context for a record without first proving that the user was authorized to view that record The commit additionally hardens pagination and terminal rendering, including neutralization of terminal control sequences found in database-backed values. Those are important hardening changes, but the main vulnerability is the CLI authorization/data-disclosure mismatch. Version affected: ≤2.5.45

Source: CVE List, as of 29 Oct 2026. About the data.

Timeline