HighPublic exploit

Authentication Bypass in Ceph RadosGW OIDC JWT Validation

IdentifiersCVE-2024-48916CWE-347

CVE-2024-48916 is an authentication bypass vulnerability in Ceph RadosGW's OpenID Connect (OIDC) authentication handling. In affected versions, RadosGW does not properly validate the JWT header algorithm and may accept a token specifying alg=none without enforcing signature verification. This allows an attacker to submit a forged JWT containing arbitrary claims that is treated as valid by the vulnerable OIDC provider logic, most likely in the rgw/sts authentication path. The issue affects Ceph deployments using RadosGW with OIDC authentication, including upstream versions through 19.2.3 and multiple downstream distribution builds referenced in the provided content.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows unauthorized authentication to vulnerable Ceph RadosGW deployments that rely on OIDC. By forging unsigned JWTs with attacker-controlled claims, an attacker may impersonate identities and obtain access to object storage resources and operations permitted to the asserted principal. The primary impact is authentication bypass leading to unauthorized access; the exact downstream impact depends on the privileges mapped from the accepted token claims in the target deployment.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, disable or restrict RadosGW OIDC authentication where feasible, especially on internet-exposed gateways. Limit access to RadosGW endpoints to trusted networks and identities, review IAM and bucket policies to minimize the privileges granted through federated/OIDC-authenticated sessions, and monitor logs for authentication attempts involving unsupported JWT algorithms or anomalous token claims. Additional compensating controls may include placing the gateway behind an authenticating reverse proxy or temporarily disabling affected federation paths until patched builds are deployed.

Remediation

Patch, then assume compromise.

Upgrade to a Ceph release or vendor-supplied package version that includes the fix for CVE-2024-48916. The documented fix updates RadosGW rgw/sts logic to explicitly reject unsupported JWT algorithms, including alg=none, and to fail authentication when an invalid or unrecognized algorithm is encountered. Because the provided content indicates distribution-specific fixes were issued, operators should apply the relevant patched package from their platform vendor or Ceph upstream advisory as appropriate.

PUBLIC EXPLOITS

Exploits

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VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

3 SOURCESView more in app

zeropath blogNews

Jul 30, 2025

Ceph RadosGW JWT Authentication Bypass (CVE-2024-48916): Brief Summary and Patch Overview - ZeroPath Blog | ZeroPath

An authentication bypass vulnerability in Ceph RadosGW's OIDC JWT validation that accepts JWTs with alg=none, allowing attackers to bypass signature verification and gain unauthorized access.

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Exposure mapping

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Threat actor evidence

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Associated malware

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Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

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