# CVE-2026-12047: pgAdmin 4: HTML injection in cloud verify_credentials / deploy endpoints via unsanitised SDK exception text

> Authenticated attackers can inject HTML into pgAdmin 4 cloud endpoints via unsanitized SDK errors, leading to XSS and potential account takeover.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/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:** Yes
- **Published:** 18 Jun 2026
- **Updated:** 22 Jun 2026
- **Also known as:** GHSA-prff-6vwq-gf23

## What is CVE-2026-12047?

CVE-2026-12047 is a medium-severity cross-site scripting vulnerability in pgadmin.org pgAdmin 4, 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

HTML injection in pgAdmin 4's cloud deployment module. The verify_credentials, deploy, regions, and update-server endpoints under /rds/, /azure/, /google/, and the top-level /cloud/ blueprint propagated AWS / Azure / Google SDK exception text — and the related file-resolution and database-commit exception text — into the JSON response body (the info and errormsg fields) without HTML-encoding. The Cloud Wizard frontend rendered these strings through html-react-parser, so an attacker-influenced exception message embedded structural HTML directly into the wizard's DOM.

The reported entry point is /rds/verify_credentials/. An authenticated pgAdmin user submits a crafted access_key whose value contains an <iframe/src=...> payload; AWS STS rejects the credential with an IncompleteSignature exception whose text quotes the access_key verbatim; the pgAdmin backend forwards that text into the JSON info field; the Cloud Wizard's FormFooterMessage parses it as HTML. The browser fetches the iframe's src from an attacker-controlled host, and JavaScript executing inside the cross-origin iframe writes to parent.location, redirecting the victim's pgAdmin tab. Because the injection renders inside pgAdmin's own interface, X-Frame-Options and Content-Security-Policy frame-ancestors do not mitigate it. Baseline impact is self-targeted (the same user who supplied the payload sees the injection); escalation against other authenticated users requires an additional cross-site request-forgery primitive capable of submitting the malformed credential request with a valid X-pgA-CSRFToken in the victim's browser context.

The same unsanitised-error-into-JSON pattern was present across multiple sibling endpoints — Azure's check_cluster_name_availability, every Google endpoint that surfaces SDK errors (verification_ack, projects, regions, instance_types, database_versions, the verify_credentials path-resolution branches), the central /deploy endpoint that bubbles str(e) from deploy_on_rds / deploy_on_azure / deploy_on_google, and update_cloud_server which surfaces the str(e) from a failing db.session.commit — all of which are now covered.

Fix HTML-escapes every external/SDK exception string at the endpoint sink via a new shared sanitize_external_text helper (HTML escape with control-character strip), promoted out of the psycopg3 driver into web/pgadmin/utils/text_sanitize.py. The Cloud Wizard frontend additionally renders its FormFooterMessage in plain-text mode for backend-derived strings, so the value is never parsed as HTML even if a future sink forgets the escape.

This issue affects pgAdmin 4: from 6.6 before 9.16.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-116 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2026-12047?

It affects 1 product.


Products: Pgadmin Pgadmin 4.

## How do I fix CVE-2026-12047?

Apply the vendor's patch.

## Is CVE-2026-12047 being exploited?

There is no known exploitation of CVE-2026-12047 in the wild and no public exploit code.

## Other vulnerabilities in pgadmin.org pgAdmin 4

- [CVE-2025-2945](https://insights.sbomify.com/CVE-2025-2945/): pgAdmin 4: Remote Code Execution in Query Tool and Cloud Deployment (critical 9.9)
- [CVE-2024-9014](https://insights.sbomify.com/CVE-2024-9014/): OAuth2 client id and secret exposed through the web browser in pgAdmin 4 (critical 9.9)
- [CVE-2026-12046](https://insights.sbomify.com/CVE-2026-12046/): Deserialization in pgAdmin 4 (critical 9.5)
- [CVE-2026-17351](https://insights.sbomify.com/CVE-2026-17351/): SQL injection in pgAdmin 4 (critical 9.4)
- [CVE-2026-17566](https://insights.sbomify.com/CVE-2026-17566/): Command injection in pgAdmin 4 (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12047 and fix it if it is affected.

What it is: CVE-2026-12047 is a medium-severity cross-site scripting vulnerability in pgadmin.org pgAdmin 4, 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-2026-12047 in the wild and no public exploit code.

Affected product: pgadmin.org pgAdmin 4. 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-2026-12047/ (Markdown: https://insights.sbomify.com/CVE-2026-12047/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12047
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12047
- OSV: https://osv.dev/vulnerability/CVE-2026-12047

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12047/
Summaries are generated and may contain mistakes; the official description above is the record.