CVE-2026-73159 cti-transmute Stored XSS via Crafted Tag Icon on Admin Triage Interface
Attackers can inject malicious HTML via crafted tag icons, leading to script execution in admin browsers on the triage interface.
- 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-2026-73159?
CVE-2026-73159 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 allow a tag's icon value to be stored and later interpolated into HTML through Vue's v-html. The helper mapIcon() previously constructed an HTML string directly from the icon value:
<i class="fas fa-${name}"></i>
Because the icon is user-supplied, a crafted value could break out of the intended markup and inject attacker-controlled HTML. When the affected tag was later rendered, including on the administrative triage interface, the payload could execute in the viewer's browser.
The patch mitigates the issue at multiple layers: v-html is replaced with Vue :class binding, mapIcon() now returns only a constrained FontAwesome class string, and the backend validates icons against the FontAwesome catalogue or a strict [a-z0-9-]{1,40} slug pattern before storing them.
Weakness: CWE-79
Which versions are affected by CVE-2026-73159?
How do I fix CVE-2026-73159?
No fix has been published for CVE-2026-73159 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-2026-73159 being exploited?
There is no known exploitation of CVE-2026-73159 in the wild and no public exploit code.
Sources
Also known as GHSA-3vx2-8r8r-pf7r.