# CVE-2026-105950: getformwork URI Sanitizer DomSanitizer.php sanitizeNodeAttribute cross site scripting

> Remote attackers can execute arbitrary scripts via the formaction argument in the URI Sanitizer component of getformwork formwork.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X`)
- **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:** 6 Oct 2026
- **Updated:** 6 Oct 2026
- **Also known as:** GHSA-3j63-cg5x-w8f2, GHSA-p78q-v3pr-p87j

## What is CVE-2026-105950?

CVE-2026-105950 is a medium-severity cross-site scripting vulnerability in getformwork formwork, published on 6 Oct 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

A security vulnerability has been detected in getformwork formwork up to 2.3.12. Impacted is the function DomSanitizer::sanitizeNodeAttribute of the file formwork/src/Sanitizer/DomSanitizer.php of the component URI Sanitizer. Such manipulation of the argument formaction leads to cross site scripting. The attack may be launched remotely. Upgrading to version 2.3.13 is recommended to address this issue. The name of the patch is 729701e59c5886685c5a1d477bdc3035e41f18b1. Upgrading the affected component is advised.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-105950?


## How do I fix CVE-2026-105950?

No fix has been published for CVE-2026-105950 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-105950 being exploited?

There is no known exploitation of CVE-2026-105950 in the wild and no public exploit code.

Public exploit code:

- Bilingual PoC and technical analysis for CVE-2026-105950 — Formwork formaction URI sanitizer bypass (github_poc): https://github.com/capivara-research/CVE-2026-105950

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-105950 and fix it if it is affected.

What it is: CVE-2026-105950 is a medium-severity cross-site scripting vulnerability in getformwork formwork, published on 6 Oct 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-2026-105950 in the wild and no public exploit code.

Affected product: getformwork formwork. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-105950/ (Markdown: https://insights.sbomify.com/CVE-2026-105950/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-105950
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-105950
- OSV: https://osv.dev/vulnerability/CVE-2026-105950

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-105950/
Summaries are generated and may contain mistakes; the official description above is the record.