CVE-2026-56424: MISP core contained multiple broken access-control flaws where authorization checks were performed against the

Q: How do I fix CVE-2026-56424?

misp: upgrade to 2.5.42. Exact commands for each OS are on this page.

Q: Is CVE-2026-56424 being exploited?

CVE-2026-56424 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-56424 affect?

CVE-2026-56424 affects misp. Severity is high (CVSS 8.8). MISP core contained multiple broken access-control flaws where authorization checks were performed against the wrong entity, or where ownership/editability checks were missing on write paths. In affected subsystems, a lower-privileged authe

Q: How urgent is CVE-2026-56424?

Priority 47/100. High severity; On your watchlist

This month

HIGH 8.8WATCHLISTUPGRADE

CVE-2026-56424 is a high-severity flaw (CVSS 8.8) affecting misp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MISP core contained multiple broken access-control flaws where authorization checks were performed against the wrong entity, or where ownership/editability checks were missing on write paths. In affected subsystems, a lower-privileged authenticated user with the relevant feature permission could cause the application to authorize one object but mutate another, or could modify objects that were merely visible rather than editable by the user’s org

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-639, CWE-862, CWE-863
Published	2026-06-22
Last modified	2026-06-23

Publisher (CNA): CIRCL · Vendor: misp-project

Last updated 2026-06-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-22 14:17 UTCPublished CVE record published
2026-06-23 15:16 UTCUpdated Record last modified

misp-project misp UPGRADE

Affected: < 2.5.42

Fixed in: 2.5.42

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy misp || rpm -q misp || misp --version

2. UPGRADE to 2.5.42 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade misp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade misp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-56424?

misp: upgrade to 2.5.42. Exact commands for each OS are on this page.

Is CVE-2026-56424 being exploited?

CVE-2026-56424 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-56424 affect?

CVE-2026-56424 affects misp. Severity is high (CVSS 8.8). MISP core contained multiple broken access-control flaws where authorization checks were performed against the wrong entity, or where ownership/editability checks were missing on write paths. In affected subsystems, a lower-privileged authe

How urgent is CVE-2026-56424?

Priority 47/100. High severity; On your watchlist

Related CVEs

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CVE-2026-85236 HIGH 8.8 UPGRADE A cross-site request forgery (CSRF) vulnerability existed in the cullEmptyEvents action of MISP
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References

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