CVE-2024-48916Public exploitNetwork attack vector

Authentication bypass via unsupported JWT algorithm fallthrough

Published Jul 30, 2025 · Updated Jul 30, 2025

Authentication bypass in Ceph RadosGW 19.2.3 and earlier allows remote authenticated users to obtain unauthorized STS credentials. WebTokenEngine::validate_signature falls through successfully when a JWT names an unsupported algorithm, so alg none reaches no verifier and no signature check runs. Exploitation requires an OIDC trust relationship and an AssumeRoleWithWebIdentity request, and it grants the role's data-reading and modification permissions without affecting availability.

CVSS severity8.1
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Ceph RadosGW 19.2.3 and earlier allows remote authenticated users to obtain unauthorized STS credentials. WebTokenEngine::validate_signature falls through successfully when a JWT names an unsupported algorithm, so alg none reaches no verifier and no signature check runs. Exploitation requires an OIDC trust relationship and an AssumeRoleWithWebIdentity request, and it grants the role's data-reading and modification permissions without affecting availability.

The record

CVE
CVE-2024-48916
Published
Jul 30, 2025
Updated
Jul 30, 2025
Vendor
Ceph
Product
Ceph
Classifications
CWE-345, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=<= 19.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ceph · Cephversion=<= 19.2.3

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1190Exploit Public-Facing Application

Public exploit references

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

Technologies

Your stack

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Your stack

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