5.3

CVE-2026-4325: Keycloak: keycloak: replay of action tokens via improper handling of single-use entries

Analyzed
AliasesCGA-22w5-6fxc-cjmfCGA-2mrg-mpfp-4fwmCGA-3j2r-p4rp-qr6p
Published 02-04-2026Last modified 07-04-2026

Vulnerability summary

CVE-2026-4325 is a medium (CVSS 5.3) vulnerability in redhat build_of_keycloak. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.4% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-GM6P-R4JV-FPXG

Timeline

  1. 02-04-2026
    PublishedVulnerability first disclosed.
  2. 07-04-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an attacker to delete arbitrary single-use entries, which can enable the replay of consumed action tokens, such as password reset links. This could lead to unauthorized access or account compromise.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

Increase +0.16 pp

From 0.25% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard12 products
  • keycloak-26.3-iamguarded-compatAll versions (No fix recorded)
  • keycloak-26.4All versions (No fix recorded)
  • keycloak-26.4-iamguarded-compatAll versions (No fix recorded)
  • keycloak-26.5< 26.5.7-r0
  • keycloak-26.5-iamguarded-compat< 26.5.7-r0
Wolfi4 products
  • keycloak-26.4All versions (No fix recorded)
  • keycloak-26.4-iamguarded-compatAll versions (No fix recorded)
  • keycloak-26.5< 26.5.7-r0
  • keycloak-26.5-iamguarded-compat< 26.5.7-r0
Org.keycloak1 product
  • keycloak-services< 26.5.7
Redhat1 product

4 vendors · 18 products

References

10 links