How severe is CVE-2026-33167?

CVE-2026-33167 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-33167 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33167?

CVE-2026-33167 affects Rubyonrails Rails. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33167?

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

Does CVE-2026-33167 have an EU (EUVD) identifier?

Yes. CVE-2026-33167 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14614.

When was CVE-2026-33167 published?

CVE-2026-33167 was published on 2026-03-23 and last updated on 2026-08-12.

CVE-2026-33167

CVE-2026-33167 is a medium-severity vulnerability in Rubyonrails Rails with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 1.3
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14614
Weakness: CWE-79
Affected product: Rubyonrails Rails
Published: 2026-03-23
Last modified: 2026-08-12

Description

Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.

Frequently asked questions

What is CVE-2026-33167?: Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.
How severe is CVE-2026-33167?: CVE-2026-33167 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-33167 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33167?: CVE-2026-33167 affects Rubyonrails Rails. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33167?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33167 have an EU (EUVD) identifier?: Yes. CVE-2026-33167 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14614.
When was CVE-2026-33167 published?: CVE-2026-33167 was published on 2026-03-23 and last updated on 2026-08-12.

References

Affected products (1)

cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*

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