# CVE-2026-55746: Cotonti stored XSS via PFS folder title

> An authenticated user can inject malicious scripts into Personal File Storage folder titles, leading to stored XSS attacks against other users.

- **Severity:** High 7.0 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N`)
- **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 available:** No
- **Published:** 18 Jun 2026
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-86hp-hf3j-3m8r

## What is CVE-2026-55746?

CVE-2026-55746 is a high-severity cross-site scripting vulnerability in Cotonti, published on 18 Jun 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

Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to stored Cross-Site Scripting in the Personal File Storage (PFS) module. A folder title (pff_title) is imported with the 'TXT' filter, which does not strip or encode HTML (the tag check in cot_import is disabled), so an authenticated user can store HTML/JavaScript in a folder title.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-55746?

2 open source packages ship an affected version, including cotonti/cotonti.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `cotonti/cotonti` | Packagist | All versions to 1.0.0 | None |
| `cotonti/cotonti` | Packagist | All versions to 1.0.0 | None |

## How do I fix CVE-2026-55746?

No fix has been published for CVE-2026-55746 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-55746 being exploited?

There is no known exploitation of CVE-2026-55746 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-55746 and fix it if it is affected.

What it is: CVE-2026-55746 is a high-severity cross-site scripting vulnerability in Cotonti, published on 18 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-55746 in the wild and no public exploit code.

Affected packages and fixed versions:
- cotonti/cotonti (Packagist): affected all versions up to 1.0.0; no fix listed
- cotonti/cotonti (Packagist): affected all versions up to 1.0.0; no fix listed

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-2026-55746/ (Markdown: https://insights.sbomify.com/CVE-2026-55746/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-55746
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-55746
- OSV: https://osv.dev/vulnerability/CVE-2026-55746

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-55746/
Summaries are generated and may contain mistakes; the official description above is the record.