CVE-2026-49977
tarteaucitron: data-cookie attribute can be used to delete arbitrary cookies
Description
### Summary tarteaucitron provides a list of cookies and buttons to delete them. If an attacker can write HTML with data attributes, they could create an element that silently deletes a cookie when clicked and trick a user to delete this cookie. ### Details `tarteaucitron.cookie.purge()` is called on any element with the `purgeBtn` class. It does not check if the element is a legitimate tarteaucitron button or if the cookie corresponds to a service handled by tarteaucitron. ### PoC ```html <a class="purgeBtn" data-cookie="foo">Click me!</a> ``` If someone has a cookie with this name and clicks on the link, the cookie is silently deleted. ### Impact The impact is limited because this only works on cookies without HttpOnly=true and the attacker has to know the name of the cookie.
How to fix CVE-2026-49977
To remediate CVE-2026-49977, upgrade the affected package to a fixed version below.
- —upgrade to 1.33.0 or later
Is CVE-2026-49977 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-49977.
Affected packages (1)
- from 0, < 1.33.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |