CVE-2026-73157 cti-transmute Remote MISP Event Browser Allows Cross-Site Scripting via Malicious Event Metadata
Attackers can inject scripts into the cti-transmute interface via malicious data from a remote MISP instance, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-73157?
CVE-2026-73157 is a low-severity cross-site scripting vulnerability in MISP cti-transmute, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Affected versions of cti-transmute render data obtained from a remote MISP instance into the event-browser interface using HTML interpolation. Because fields such as event IDs, event information, organization names, tags, tag colors, TLP labels, distribution labels, and error/flash text may be controlled by the remote MISP server, a malicious or compromised remote instance could return crafted values that inject HTML or script-capable content into the cti-transmute interface.
The patch explicitly notes that remote-derived values must not reach innerHTML, and replaces string-built rows and badges with DOM nodes populated through textContent. It also restricts remote-controlled tag colors to six-digit hexadecimal values, preventing malicious CSS values such as url(...).
Which versions are affected by CVE-2026-73157?
How do I fix CVE-2026-73157?
No fix has been published for CVE-2026-73157 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-73157 being exploited?
There is no known exploitation of CVE-2026-73157 in the wild and no public exploit code.
Sources
Also known as GHSA-fh4x-m2h5-c6vx.