01 Record
CVE-2026-48558
SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
CriticalKEVPUBLISHEDCNA: VulnCheck
CNA base score9.5 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
02 Description
SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
03 Exploitation and scoring
- Exploitation
- Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2026-06-29. Federal remediation due 2026-07-02.
- SSVC decision
- ExploitationactiveCISA reports credible evidence of active exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 77.65% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 99.5% of scored records. A rank, not a probability.
- NVD base score
- 9.5 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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 analysis status
- Analyzed. NVD last modified this record on 2026-10-07.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-06-12 17:07Z4 MO AGO
- Last updated
- 2026-10-07 19:26Z21 DAYS AGO
- Reserved
- 2026-05-21
- Assigning CNA
- VulnCheck
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.5)
- CNA CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- Weaknesses
- CWE-347Improper Verification of Cryptographic SignatureBase
- Data version
- 5.2
- Document digest
- bf6f07d90e6772901a49521f332ee926692734c20dbc8ba01995774b2a64379b
05 Affected products
VendorProductVersionsPlatforms
06 References
- horizon3.aihttps://horizon3.ai/attack-research/disclosures/cve-2026-48558-simplehelp-authentication-bypass-iocs/
- simple-help.comhttps://simple-help.com/security/simplehelp-security-update-2026-05
- simple-help.comhttps://simple-help.com/release-news
- blackpointcyber.comhttps://blackpointcyber.com/blog/a-djinn-in-the-machine-taskweavers-node-js-intrusion-chain/
- www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48558