# CVE-2021-29651: JWT leak via Open Redirect in Programmatic access

> An attacker can redirect users to malicious sites via Pomerium, potentially facilitating phishing attacks.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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:** 2 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-35vc-w93w-75c2, GO-2022-0783

## What is CVE-2021-29651?

CVE-2021-29651 is a medium-severity vulnerability in n/a, published on 2 Apr 2021. 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

Pomerium before 0.13.4 has an Open Redirect (issue 1 of 2).

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2021-29651?

3 open source packages ship an affected version, including github.com/pomerium/pomerium. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/pomerium/pomerium` | Go | All versions | 0.13.4 |
| `github.com/pomerium/pomerium` | Go | All versions | 0.13.4 |
| `github.com/pomerium/pomerium` | Go | All versions | 0.13.4 |

Products: Pomerium Pomerium.

## How do I fix CVE-2021-29651?

Upgrade github.com/pomerium/pomerium to 0.13.4 or later.

## Is CVE-2021-29651 being exploited?

There is no known exploitation of CVE-2021-29651 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-33189](https://insights.sbomify.com/CVE-2023-33189/): Incorrect Authorization with specially crafted requests (critical 10.0)
- [CVE-2022-24797](https://insights.sbomify.com/CVE-2022-24797/): Exposure of Sensitive Information in Pomerium (medium 6.5)
- [CVE-2021-29652](https://insights.sbomify.com/CVE-2021-29652/): pomerium_signature is not verified in middleware in github.com/pomerium/pomerium (medium 6.1)
- [CVE-2024-39315](https://insights.sbomify.com/CVE-2024-39315/): Pomerium exposed OAuth2 access and ID tokens in user info endpoint response (medium 5.7)
- [CVE-2021-41230](https://insights.sbomify.com/CVE-2021-41230/): OIDC claims not updated from Identity Provider in Pomerium (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-29651 and fix it if it is affected.

What it is: CVE-2021-29651 is a medium-severity vulnerability in n/a, published on 2 Apr 2021. 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-2021-29651 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/pomerium/pomerium (Go): affected all versions; fixed in 0.13.4
- github.com/pomerium/pomerium (Go): affected all versions; fixed in 0.13.4
- github.com/pomerium/pomerium (Go): affected all versions; fixed in 0.13.4

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-2021-29651/ (Markdown: https://insights.sbomify.com/CVE-2021-29651/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-29651
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-29651
- OSV: https://osv.dev/vulnerability/CVE-2021-29651

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-29651/
Summaries are generated and may contain mistakes; the official description above is the record.