How severe is CVE-2026-73631?

CVE-2026-73631 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-73631 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-73631?

CVE-2026-73631 affects Apache Struts. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-73631?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-73631 published?

CVE-2026-73631 was published on 2026-08-15 and last updated on 2026-08-18.

CVE-2026-73631

CVE-2026-73631 is a medium-severity vulnerability in Apache Struts with a CVSS 3.x base score of 4.3. 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-567.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-567
Affected product: Apache Struts
Published: 2026-08-15
Last modified: 2026-08-18

Description

Exposure of data element to wrong session vulnerability in the JSON plugin of Apache Struts. Per-request parsing state could be shared across concurrent requests, allowing data associated with one request to become observable in another, and configured parsing limits not to be enforced as intended. Populating actions from a JSON request body is not enabled by default; applications that do not use the JSON plugin are not affected. This issue affects Apache Struts: 7.2.1. Users are recommended to upgrade to version 7.3.0, which fixes the issue.

Frequently asked questions

What is CVE-2026-73631?: Exposure of data element to wrong session vulnerability in the JSON plugin of Apache Struts. Per-request parsing state could be shared across concurrent requests, allowing data associated with one request to become observable in another, and configured parsing limits not to be enforced as intended. Populating actions from a JSON request body is not enabled by default; applications that do not use the JSON plugin are not affected. This issue affects Apache Struts: 7.2.1. Users are recommended to upgrade to version 7.3.0, which fixes the issue.
How severe is CVE-2026-73631?: CVE-2026-73631 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-73631 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-73631?: CVE-2026-73631 affects Apache Struts. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-73631?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-73631 published?: CVE-2026-73631 was published on 2026-08-15 and last updated on 2026-08-18.

References

https://cwiki.apache.org/confluence/display/WW/S2-070

Affected products (1)

cpe:2.3:a:apache:struts:7.2.1:*:*:*:*:*:*:*

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