What is CVE-2026-57818?

CVE-2026-57818 is a high-severity vulnerability in Apache Cxf, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 8.1/10. Published 2026-08-06.

How severe is CVE-2026-57818?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Apache Cxf

CVE-2026-57818

A race condition in JCacheCodeDataProvider allows an attacker to redeem a single authorization code multiple times via concurrent requests, resulting in the issuance of multiple distinct, valid access tokens. Users are recommended to upgrade to versions 4.2.3, 4.1.8 or 3.6.12, which fix this issue.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

Published 2026-08-06 · last modified 2026-10-24.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (40.8th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Apache Cxf
Apache Software Foundation Cxf — versions 4.2.0, 4.0.0, 0

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

lists.apache.org/thread/7q08mz8bcbosp25wok7gr537zlp15mfz (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-57818?: CVE-2026-57818 is a high-severity vulnerability in Apache Cxf, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 8.1/10. Published 2026-08-06.
How severe is CVE-2026-57818?: High severity. CVSS v3 base score is 8.1 out of 10.