CVE-2026-73161 cti-transmute Conversion Table Allows XSS via Unescaped Cell Content During Search Highlighting
Attackers can inject malicious HTML via unescaped conversion table content in search highlighting, leading to XSS in MISP environments.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-73161?
CVE-2026-73161 is a medium-severity cross-site scripting vulnerability in MISP cti-transmute, published on 11 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Affected versions of cti-transmute improperly handle conversion-table values passed through the search highlighting feature. The highlight() function previously returned the underlying text directly when no search query was supplied, or performed a regex replacement that inserted <mark> tags without first escaping the original content. Because the resulting value is used by an HTML-rendering sink, malicious markup contained in conversion data could be interpreted as HTML rather than displayed as text.
The fix introduces a shared highlightMatches() helper that first converts special characters such as <, >, &, and quotes into HTML entities. Only after escaping does the code insert the application-controlled <mark> element used for search highlighting.
Which versions are affected by CVE-2026-73161?
How do I fix CVE-2026-73161?
No fix has been published for CVE-2026-73161 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-2026-73161 being exploited?
There is no known exploitation of CVE-2026-73161 in the wild and no public exploit code.
Sources
Also known as GHSA-9p42-c923-p9c9.