How severe is CVE-2023-34478?

CVE-2023-34478 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-34478 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-34478?

CVE-2023-34478 primarily affects Apache Shiro. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-34478?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-34478 published?

CVE-2023-34478 was published on 2023-07-24 and last updated on 2026-06-17.

CVE-2023-34478

CVE-2023-34478 is a critical-severity vulnerability in Apache Shiro with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Apache Shiro
Published: 2023-07-24
Last modified: 2026-06-17

Description

Apache Shiro, before 1.12.0 or 2.0.0-alpha-3, may be susceptible to a path traversal attack that results in an authentication bypass when used together with APIs or other web frameworks that route requests based on non-normalized requests. Mitigation: Update to Apache Shiro 1.12.0+ or 2.0.0-alpha-3+

Frequently asked questions

What is CVE-2023-34478?: Apache Shiro, before 1.12.0 or 2.0.0-alpha-3, may be susceptible to a path traversal attack that results in an authentication bypass when used together with APIs or other web frameworks that route requests based on non-normalized requests. Mitigation: Update to Apache Shiro 1.12.0+ or 2.0.0-alpha-3+
How severe is CVE-2023-34478?: CVE-2023-34478 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-34478 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-34478?: CVE-2023-34478 primarily affects Apache Shiro. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-34478?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-34478 published?: CVE-2023-34478 was published on 2023-07-24 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:apache:shiro:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:shiro:2.0.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:apache:shiro:2.0.0:alpha2:*:*:*:*:*:*

More vulnerabilities in Apache Shiro

CVE-2022-40664 — Critical (CVSS 9.8): Apache Shiro before 1.10.0, Authentication Bypass Vulnerability in Shiro when forwarding or including via…
CVE-2022-32532 — Critical (CVSS 9.8): Apache Shiro before 1.9.1, A RegexRequestMatcher can be misconfigured to be bypassed on some servlet containers.…
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CVE-2020-17510 — Critical (CVSS 9.8): Apache Shiro before 1.7.0, when using Apache Shiro with Spring, a specially crafted HTTP request may cause an…
CVE-2020-11989 — Critical (CVSS 9.8): Apache Shiro before 1.5.3, when using Apache Shiro with Spring dynamic controllers, a specially crafted request may…

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