CVE-2026-97055

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.

Overview

State: PUBLISHED
Assigner (CNA): VulnCheck
CVSS severity: CRITICAL
CVSS score: 9.2 / 10
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
Effective score: 9.2 / 10 CRITICAL source: CNA overview
CWE(s): CWE-1188
Reserved: 2026-09-23
Published: 2026-09-24 01:53 UTC
Last updated: 2026-09-24 12:58 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/97xxx/CVE-2026-97055.json
Linked Threat: CVE-2026-97055 — SigNoz before 0.143.0 Authentication Bypass via Empty JWT Secret

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

EPSS score: 0.0041 (probability of exploitation in next 30 days)
EPSS percentile: 32.07% vs all CVEs — higher = more likely to be exploited, as of 2026-09-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-85774
Assigner: VulnCheck
Published: Sep 24, 2026, 1:53:03 AM
Updated: Sep 24, 2026, 12:58:15 PM
EUVD base score (CVSS 4.0): 9.2 / 10
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
EUVD-reported EPSS: 0.4100
Vendors: SigNoz
Products: signoz (0.8.0 <0.143.0)
Aliases: GHSA-m7r9-jq4r-hmr3

ENISA 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.

EUVD references (4)

Affected products (1)

Vendor	Product	Versions	Platforms
SigNoz	signoz	`0.8.0` (affected), `0.143.0` (unaffected)	—

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

GitHub Security Advisory (GHSA-c26w-g4j8-39m2) vendor-advisory
Patch Commit patch
Patch Commit patch
VulnCheck Advisory: SigNoz before 0.143.0 Authentication Bypass via Empty JWT Secret third-party-advisory

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-97055 SigNoz — Exploit & Vulnerability Details CRITICAL ...

web:anonhaven.com

SigNoz from v0.8.0 before v0.143. 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 ...

2026-09-25 10:08 UTC
CVE-2026-97055: SigNoz Vulnerability (CVSS 8.1) | CVETodo

web:cvetodo.com

CVE-2026-97055 : Initialization of a Resource with an Insecure Default in SigNoz (CVSS 8.1). Includes technical details, affected versions, and mitigation steps.

2026-09-25 10:08 UTC
Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-25 10:08 UTC
March 10, 2026—Hotpatch KB5079420 (OS Builds 26200.7979 and 26100.7979 ...

web:support.microsoft.com

This Hotpatch update for Windows 11, version 25H2 and 24H2 (KB5079420), improves functionality, performance, and reliability. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of ...

2026-09-25 10:08 UTC
SAP Security Patch Day - June 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 9th of June 2026 , SAP security patch day saw the release of 15 new security notes.

2026-09-25 10:08 UTC
September 2026 Patch Tuesday: CISO Executive Summary

web:www.action1.com

This CISO-focused summary highlights the vulnerabilities and critical infrastructure risks that should take priority for remediation following Microsoft's September 2026 Patch Tuesday release.

2026-09-25 10:08 UTC
CVE-2026-97055 - Detail CVSS, EPSS & CISA Kev | CVE Find

web:www.cvefind.com

Full details for CVE-2026-97055 : technical description, impact, CVSS/EPSS scores, linked CWE, CAPEC, affected CPEs, disclosure date, and mitigation options.

2026-09-25 10:08 UTC
Oracle Critical Patch Update Advisory - January 2026

web:www.oracle.com

Oracle Critical Patch Update Advisory - January 2026 Description A Critical Patch Update is a collection of patches for multiple security vulnerabilities. These patches address vulnerabilities in Oracle code and in third party components included in Oracle products. These patches are usually cumulative, but each advisory describes only the security patches added since the previous Critical ...

2026-09-25 10:08 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-25 10:08 UTC
Patch Tuesday September 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's September 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-09-25 10:08 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-97055.json.

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