# CVE-2026-97055: SigNoz before 0.143.0 Authentication Bypass via Empty JWT Secret

> Unauthenticated attackers can forge session tokens for any user, including admins, due to a default empty JWT secret, leading to full account takeover.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Sep 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-c26w-g4j8-39m2, GHSA-m7r9-jq4r-hmr3

## What is CVE-2026-97055?

CVE-2026-97055 is a critical authentication bypass vulnerability in signoz, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

SigNoz from v0.8.0 before v0.143.0 defaults the JWT tokenizer signing secret (tokenizer::jwt::secret, set via SIGNOZ_TOKENIZER_JWT_SECRET or the deprecated SIGNOZ_JWT_SECRET) to an empty string, and Config.Validate() does not reject the empty value, so a deployment that does not configure a secret starts up and both signs and verifies session tokens with an empty HMAC key. Because the JWT tokenizer was the default provider, any such deployment is affected. An unauthenticated attacker who knows the ID of an existing user can forge a valid session token for that user — including an administrator — by signing the id, orgId and email claims with an empty key; the organization ID (and whether an email is registered) can be obtained without authentication from /api/v2/sessions/context. A forged refresh token can be exchanged at /api/v2/sessions/rotate for a new token pair and cannot be revoked, so it remains usable for its full lifetime (30 days by default). Fixed in v0.143.0, which requires a JWT secret when the jwt provider is selected and changes the default provider to opaque.

Weakness: CWE-1188 (Initialization of a Resource with an Insecure Default)

## Which versions are affected by CVE-2026-97055?


## How do I fix CVE-2026-97055?

No fix has been published for CVE-2026-97055 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-97055 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-97055 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-97055 and fix it if it is affected.

What it is: CVE-2026-97055 is a critical authentication bypass vulnerability in signoz, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-97055 exists.

Affected product: signoz. 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-2026-97055/ (Markdown: https://insights.sbomify.com/CVE-2026-97055/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-97055
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-97055
- OSV: https://osv.dev/vulnerability/CVE-2026-97055

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-97055/
Summaries are generated and may contain mistakes; the official description above is the record.