CVE-2023-49091Public exploitNetwork attack vector

Unauthorized access via unrevoked JWTs

Published Nov 29, 2023 · Updated Jan 21, 2025

Insufficient session expiration in Beyond Cloud ltd. Cosmos Server before 0.13.1 allows remote attackers to access protected resources. UserRegister writes PassowrdCycle instead of PasswordCycle, so the token-revocation counter is not advanced and existing JWTs remain accepted. Exploitation requires possession of a previously issued JWT and a victim password change or logout, after which protected data can be read, modified, or deleted.

CVSS severity8.8
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Insufficient session expiration in Beyond Cloud ltd. Cosmos Server before 0.13.1 allows remote attackers to access protected resources. UserRegister writes PassowrdCycle instead of PasswordCycle, so the token-revocation counter is not advanced and existing JWTs remain accepted. Exploitation requires possession of a previously issued JWT and a victim password change or logout, after which protected data can be read, modified, or deleted.

The record

CVE
CVE-2023-49091
Published
Nov 29, 2023
Updated
Jan 21, 2025
Vendor
Beyond Cloud ltd.
Product
Cosmos Server
Classifications
CWE-613, T1550.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.13.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Beyond Cloud ltd. · Cosmos Serverversion=< 0.13.1

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1550.001Application Access Token

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo