8.1

CVE-2026-57817: apache software foundation apache cxf Improper Input Validation

CVSS: 8.1v3.1HighModified
Published 06-08-2026Last modified 07-08-2026
Open JSON

Vulnerability summary

CVE-2026-57817 is a high (CVSS 8.1) Improper Input Validation vulnerability in apache software foundation apache cxf. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 51.9% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.69%
0%100%
Low · +0.24 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 06-08-2026
    PublishedVulnerability first disclosed.
  2. 07-08-2026
    Last modifiedVulnerability information updated.

Description

The OpenID Connect Core 1.0 specification mandates that the RP MUST validate the `c_hash` parameter when operating in the Hybrid Flow. If an Apache CXF RP is integrated with a non-compliant or misconfigured Identity Provider (IdP) that omits the `c_hash`, the RP becomes vulnerable to Authorization Code Substitution/Injection attacks. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.69%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

+0.24 pp

From 0.45% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.69%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apache1 product
  • cxf< 3.6.12 | ≥ 4.0.0, < 4.1.8 | ≥ 4.2.0, < 4.2.3
Apache software foundation1 product
  • apache cxf≥ 4.2.0, < 4.2.3 | ≥ 4.0.0, < 4.1.8 | < 3.6.12

2 vendors · 2 products

References

2 links