CVE-2025-26467

Apache Cassandra: User with MODIFY permission on ALL KEYSPACES can escalate privileges to superuser via unsafe actions (4.0.16 only)

HIGH

8.8

CVSS Score

Published: August 25, 2025 at 02:06 PM UTC

Updated: June 17, 2026 at 09:01 AM UTC

1 product affected across 1 vendorCassandra

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Severity

HIGH8.8

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

Description

Privilege Defined With Unsafe Actions vulnerability in Apache Cassandra. An user with MODIFY permission ON ALL KEYSPACES can escalate privileges to superuser within a targeted Cassandra cluster via unsafe actions to a system resource. Operators granting data MODIFY permission on all keyspaces on affected versions should review data access rules for potential breaches. This issue affects Apache Cassandra 3.0.30, 3.11.17, 4.0.16, 4.1.7, 5.0.2, but this advisory is only for 4.0.16 because the fix to CVE-2025-23015 was incorrectly applied to 4.0.16, so that version is still affected. Users in the 4.0 series are recommended to upgrade to version 4.0.17 which fixes the issue. Users from 3.0, 3.11, 4.1 and 5.0 series should follow recommendation from CVE-2025-23015.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cassandra · Apachemaven

95%

3.0.0 ≤ v < 3.0.313.11.0 ≤ v < 3.11.184.0.0 ≤ v < 4.0.174.1.0 ≤ v < 4.1.85.0.0 ≤ v < 5.0.34.0.16

Affected range stops below 3.0.31, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.11.18, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.0.17, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.1.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://lists.apache.org/thread/xxj36rr4d6mzyqpld05dn8b9951hfpz7

References (1)

Vendor AdvisoryMailing List

Source: [email protected]

https://lists.apache.org/thread/xxj36rr4d6mzyqpld05dn8b9951hfpz7

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-267

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