GHSA-24v3-254g-jv85 Tuta Mail has DOM attribute and CSS injection in its Contact Viewer feature
Attackers can inject DOM attributes and CSS via crafted contacts, overriding link targets and button appearance, potentially leading to phishing or UI spoofing.
- 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
- Available
What is GHSA-24v3-254g-jv85?
GHSA-24v3-254g-jv85 is a cross-site scripting vulnerability in @tutao/tutanota-utils, published on 19 Dec 2025. 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
Impact
Users importing contacts from untrusted sources.
Specifically crafted contact data can lead to some of DOM modifications for the link button next to the field e.g. the link address can be overriden. CSS can be manipulated to give the button arbitrary look and change it's size so that any click on the screen would lead to the specified URL. Modifying event listeners does not seem to be possible so no JS can be executed (which would also be prevented by CSP).
Technical details
The data is included as part of the mithril's hyperscript selector. It is possible to define a value like ][href=https://ddg.gg][style=position:fixed;width:150vw;height:200vh which will be included in the selector passed to Mithril and will be interpreted as part of the code.
Patches
https://github.com/tutao/tutanota/commit/e28345f5f78f628f9d5c04e785f79543f01dca8b
Workarounds
Do not open contact viewer on unpatched versions. If the contact was opened, close the app or use keyboard shortcuts to switch to another part of the app.
Which versions are affected by GHSA-24v3-254g-jv85?
2 open source packages ship an affected version, including @tutao/tutanota-utils.
| Package | Affected | Fixed in |
|---|---|---|
@tutao/tutanota-utils npm | All versions | 314.251111.0 |
@tutao/tutanota-utils npm | All versions | 314.251111.0 |
How do I fix GHSA-24v3-254g-jv85?
Upgrade @tutao/tutanota-utils to 314.251111.0 or later.
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 GHSA-24v3-254g-jv85 being exploited?
There is no known exploitation of GHSA-24v3-254g-jv85 in the wild and no public exploit code.