Is CVE-2026-103239 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-103239 being exploited in the wild.

How severe is CVE-2026-103239?

Informational severity, published 30 September 2026.

Is there a fix for CVE-2026-103239?

A patch was published on 2026-09-25: Fix applied in commit 96f735e7b Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-103239 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-103239?

Check whether you run Misp at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-103239: MISP privilege escalation in tag collection edit

CVE-2026-103239 · Severity: info · Published 2026-09-30

MISP is a platform for sharing threat intelligence information across organizations. A user with basic tag editor permissions could inject malicious data into tag collection requests to create or modify administrator accounts, gaining full control of the system. An attacker with limited access could escalate to complete administrative control without needing higher privileges.

Technologies: Misp. Vendors: Misp.

Quick answers

Is CVE-2026-103239 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-103239 being exploited in the wild.
How severe is CVE-2026-103239?: Informational severity, published 30 September 2026.
Which products and versions are affected?: Misp < 2.5.48.
Is there a fix for CVE-2026-103239?: A patch was published on 2026-09-25: Fix applied in commit 96f735e7b Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-103239 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-103239?: Check whether you run Misp at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The addWithTags/editWithTags functions pass the entire HTTP request payload to saveAssociated(), enabling a perm_tag_editor user to inject sibling User or Organisation records. The bulk-association save operation writes all associated models indiscriminately without validating the request scope, allowing privilege escalation to site administrator. The vulnerability requires authentication with the tag_editor permission and network access to the MISP instance.

Affected products

MISP MISP < 2.5.48

Timeline

2026-09-30: disclosed: CVE-2026-103239 published
2026-09-25: patched: Fix applied in commit 96f735e7b

References

https://github.com/MISP/MISP/commit/96f735e7b

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