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CVE-2026-97055· NVD / CVE Program· CNA VulnCheck

SigNoz before 0.143.0 Authentication Bypass via Empty JWT Secret

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.

CriticalCVSS 9.2 · v4.0—No exploit Fix available
Published
Sep 23, 2026
Updated
Sep 24, 2026
EPSS
0.4% · 33th percentile
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Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
9.2
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • SigNoz signoz

    • 0.143.0not affected
    • 0.8.0 and later · before 0.143.0affected · semver

Same product

signoz: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-92729SigNoz 0.88.0 through 0.141.0 - Missing Authentication on Trace Funnel Analytics Endpoints
    35Monitor
  • CVE-2026-93426SigNoz 0.87.0 before 0.142.0 - SQL Injection in v5 Query Builder Field Key Names
    33Monitor
  • CVE-2026-93292SigNoz 0.88.0 before 0.142.1 - SQL Injection in Trace Funnel Analytics Query Builders
    33Monitor
  • CVE-2026-57955SigNoz 0.130.1 - SQL Injection in Alert History Endpoints via Rule ID Parameter
    33Monitor
  • CVE-2026-97056SigNoz before 0.143.0 Insufficient Session Expiration Authentication Bypass
    30Monitor
  • CVE-2026-63094SigNoz < 0.134.0 SSO OAuth State Manipulation Session Token Theft
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
SigNoz signoz0.143.0Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-932926 days apartSigNoz 0.88.0 before 0.142.1 - SQL Injection in Trace Funnel Analytics Query Builders
    33Monitor
  • CVE-2026-934266 days apartSigNoz 0.87.0 before 0.142.0 - SQL Injection in v5 Query Builder Field Key Names
    33Monitor
  • CVE-2026-5795586 days apartSigNoz 0.130.1 - SQL Injection in Alert History Endpoints via Rule ID Parameter
    33Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-1188 · Initialization of a Resource with an Insecure Default

CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records