# CVE-2026-49977: tarteaucitron.js: data-cookie attribute can be used to delete arbitrary cookies

> An attacker can delete arbitrary non-HttpOnly cookies by injecting HTML with specific data attributes, requiring user interaction to trigger the deletion.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N`)
- **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:** Yes
- **Published:** 17 Jul 2026
- **Updated:** 20 Jul 2026
- **Also known as:** DRUPAL-CONTRIB-2026-040, GHSA-jxj7-g6gm-49j7

## What is CVE-2026-49977?

CVE-2026-49977 is a medium-severity vulnerability in AmauriC tarteaucitron.js, published on 17 Jul 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

tarteaucitron.js is a compliant and accessible cookie banner. Prior to 1.33.0, tarteaucitron.cookie.purge() is called on any element with the purgeBtn class and does not check whether the element is a legitimate tarteaucitron button or whether the cookie corresponds to a service handled by tarteaucitron. If an attacker can write HTML with data attributes, an element with data-cookie can silently delete a non-HttpOnly cookie with a known name when clicked by a user. This issue is fixed in version 1.33.0.

Weakness: CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2026-49977?

2 open source packages ship an affected version, including tarteaucitronjs.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `tarteaucitronjs` | npm | All versions | 1.33.0 |
| `tarteaucitronjs` | npm | All versions | 1.33.0 |
| `drupal/tacjs` | Packagist:https://packages.drupal.org/8 | All versions | 6.8.0 |

## How do I fix CVE-2026-49977?

Upgrade tarteaucitronjs to 1.33.0 or later.

## Is CVE-2026-49977 being exploited?

There is no known exploitation of CVE-2026-49977 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-49977 and fix it if it is affected.

What it is: CVE-2026-49977 is a medium-severity vulnerability in AmauriC tarteaucitron.js, published on 17 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-49977 in the wild and no public exploit code.

Affected packages and fixed versions:
- tarteaucitronjs (npm): affected all versions; fixed in 1.33.0
- tarteaucitronjs (npm): affected all versions; fixed in 1.33.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-49977/ (Markdown: https://insights.sbomify.com/CVE-2026-49977/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-49977
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-49977
- OSV: https://osv.dev/vulnerability/CVE-2026-49977

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-49977/
Summaries are generated and may contain mistakes; the official description above is the record.