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Response snapshot Nov 3, 2026, 22:26 UTC

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VulnerabilityCVE-2026-56091

Apache Shiro shiro-guice module vulnerable to authentication bypass

When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may cause an authentication bypass. This vulnerability is similar to https://www.cve.org/CVERecord?

At a glance

Exploited
Not known
Severity
8.2 High (CVSS 4.0)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: org.apache.shiro:shiro-guice: 3.0.0. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-qj64-jj84-w38j (opens a new tab)

What happened

When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may cause an authentication bypass. This vulnerability is similar to https://www.cve.org/CVERecord?id=CVE-2020-1957, except that it affects the shiro-guice module instead of the shiro-spring module.

This issue affects all Apache Shiro versions through 2.x, and 3.0.0-alpha-1 only when using shiro-guice module in a web servlet context.

Upgrade to version 3.0.0 or later, which fixes the issue.

Affected package ranges reported by GitHub: org.apache.shiro:shiro-guice: >= 2.0.0, < 3.0.0

Scores and how they were measured

CVSS base severity

8.2

Version 4.0As of

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/S:P/AU:Y/V:D/RE:L/U:Amber

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-qj64-jj84-w38j (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-qj64-jj84-w38j, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 3). Apache Shiro shiro-guice module vulnerable to authentication bypass (CVE-2026-56091). https://kevwire.com/record/CVE-2026-56091

MLA

"Apache Shiro shiro-guice module vulnerable to authentication bypass (CVE-2026-56091)." KEVWire, 3 Nov. 2026, kevwire.com/record/CVE-2026-56091.

Chicago

KEVWire. "Apache Shiro shiro-guice module vulnerable to authentication bypass (CVE-2026-56091)." Last modified November 3, 2026. https://kevwire.com/record/CVE-2026-56091.

Evidence summary (plain text)

Apache Shiro shiro-guice module vulnerable to authentication bypass (Jun 25, 2026).
When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may cause an authentication bypass.
This vulnerability is similar to https://www.cve.org/CVERecord?id=CVE-2020-1957, except that it affects the shiro-guice module instead of the shiro-spring module.

This issue affects all Apache Shiro versions through 2.x, and 3.0.0-alpha-1 only when using shiro-guice module in a web servlet context.

Upgrade to version 3.0.0 or later, which fixes the issue.
CVSS 8.2 (version 4.0; evidence as of Nov 3, 2026; https://github.com/advisories/GHSA-qj64-jj84-w38j).
Sources:
GitHub-reviewed advisory GHSA-qj64-jj84-w38j: https://github.com/advisories/GHSA-qj64-jj84-w38j
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-56091.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 3, 2026, 22:20 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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