CVE-2026-7571

Description

A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure.

CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

EPSS — Exploit Prediction

0.0034

Probability of exploitation

0.26%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-472 CWE-472

References

Other References

https://access.redhat.com/errata/RHSA-2026:19596 https://access.redhat.com/errata/RHSA-2026:19597 https://access.redhat.com/security/cve/CVE-2026-7571 https://bugzilla.redhat.com/show_bug.cgi?id=2464263

Frequently Asked Questions

What is CVE-2026-7571? +

A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-7571? +

CVE-2026-7571 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0034, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-7571? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-32699

FacturaScripts is an open source accounting and invoicing software. In versions 2025.92 and earlier, the application fails to validate the …

CVE-2025-26312

SendQuick Entera devices before 11HF5 are vulnerable to CAPTCHA bypass by removing the Captcha parameter.

CVE-2025-66385

UsersController::edit in Cerebrate before 1.30 allows an authenticated non-privileged user to escalate their privileges (e.g., obtain a higher role such …

CVE-2024-12123

A hidden field manipulation vulnerability was identified in Issuetrak version 17.1 that could be triggered by an authenticated user. When …

CVE-2025-59382

QTS, QuTS hero, QuTScloud are not affected. We have already fixed the vulnerability in the following version:

CVE-2025-43930 9.8

Hashview 0.8.1 allows account takeover via the password reset feature because SERVER_NAME is not configured and thus a reset depends …